While playing the DLC map Nightfall, notice the metal canisters attached to telephone phones. Some of these will have sparks coming out of them. With the Maverick assault rifle, destroy all four canisters that are sparking (they spark in a certain order). The word ZAP will appear across the screen to confirm that you succeeded. Activating this easter egg will cause all killed aliens to explode into pieces of snowmen. For a better idea of how to do this, check out the video below:
"Carbon Faceprint" Toward the end of Mission 7: Federation Day, after you turn off the elevators to stop enemy forces from closing in on your position, you will rappel down a building for the 3rd time. Once you interact with the rope, just wait for a couple of seconds and don't do anything. The photocopier will fall right on your face, unlocking the "Carbon Faceprint" trophy/achievement.
"Deep Freeze" Near the end of Mission 10: Clockwork you must escape an enemy facility. While your teammate is driving you will be using a grenade launcher turret. There will be plenty of vehicles chasing you. Instead of shooting at them directly, shoot just in front of them to blow a hole into the ground. If they drive over it, the vehicle and its crew will get knocked out, which counts towards this achievement/trophy. Do the same to 8 different vehicles before reaching the end of the mission to unlock the achievement/trophy.
"It Came From Below!" There are three different locations in Mission 6: Legends Never Die where you can kill enemies while underwater. The water is only waist-deep so crouch, and then kill enemies with your knife. Do this on the "Rookie" difficulty to make it easier. Enemies will still be shooting at you when you go underwater, and you must get very close to them to perform knife kills. Simply run up to the enemies standing in water, crouch, and use the knife to kill them to unlock the achievement/trophy.
"Liberty Wall" Play Mission 2: Brave New World and after taking out the enemies at the gas station, you will have to fight your way through an old sewer. Once you reach the end of this area, you will be attacked by two helicopters. The first (smaller) helicopter will eventually fly away, so take it down quickly. There are many MAAWS rocket launchers on some crates. Take one and, when shooting, keep aiming at your target to guide the missile. Shoot down both helicopters using the rocket launcher to unlock the achievement/trophy.
"Sleeping Beauty" After you upload the virus in the server room on Mission 7: Federation Day, , you must rappel down the building. Kill the two enemies on a balcony first to avoid being detected. Two floors below that balcony is an enemy sleeping in a chair. Shoot him through the window to unlock the achievement/trophy.
"Waste Not" In Mission 4: Struck Down you must use the remote sniper four times to progress in the mission. Only fire when your crosshairs turn yellow to make it a guaranteed hit. In the first sequence you must kill at least one enemy, and your team will do the rest. In the second sequence you must take out four enemies with rocket launchers. In the third sequence, you must clear an airfield, and kill several enemies. During the fourth sequence you have to kill the three enemies that fire their MGs from vehicles. If you miss a shot, just restart the checkpoint at any time. Even if you restart, you will still to unlock the achievement/trophy.
"Cog In The Machine" At the start of Mission 13: End Of The Line, quietly kill the first five enemies by yourself, making sure you're not seen or heard. Kills from your teammates do not count. Use silenced weapons to remain undetected. The first kill will happen automatically when you jump down a ledge, the second enemy is in the train yard, and the third enemy is with three other enemies. Wait until your teammates arrive and shoot either one of the enemies. Your team will take out the rest. The fourth and fifth enemies are behind the gate that your teammate opens for you. Go prone and kill both of them quickly before your teammates take them out.
"David & Goliath" Toward the middle of Mission 12: Into The Deep you must use a torpedo to destroy a warship. While guiding the torpedo, you will automatically be using thermal vision and can see a red area on the side of the ship. Hit this red area to destroy the LCS and unlock the achievement/trophy.
"End Of Your Rope" At the start of Mission 15: All Or Northing you must clear the flight deck of enemies. Once done, you will have to pick up the Osprey targeting control. After you pick it up, enemies will start attacking the ship from the side. They will come in dinghies and throw grappling hooks on the ship. Wait until an enemy starts climbing the rope, then cut it with your knife to unlock the achievement/trophy.
"Fly-by-wire" Just after Mission 16: Severed Ties starts, you will see a prompt on the screen that says "Press TRIANGLE/Y to switch to guided rounds". When this occurs, attack helicopters will arrive. Just do as instructed and switch to guided rounds to shoot down all three helicopters and unlock the achievement/trophy.
"Grindin'" Near the end of Mission 11: Atlas Falls you must use a console to regulate the pressure of some valves. It is part of the story and cannot be missed. There will be three bars on the screen. You need to keep them in the center, so they are colored green. Use the Left Analog-stick to move the bars up and down to keep them in the green zone. It doesn't matter if they drop to the yellow zone briefly, just as long as you bring them back to the green zone quick enough.
"Jack-pot" During Mission 14: Sin City, you will come upon an egyptian casino. Tons of enemies will ambush you in this area. Destroy every slot machine in this area by shooting their screens. At the end of the casino is a gate that one of your teammates will raise for you. Go under it, and you will reach a broken escalator. Before walking down the escalator, look to the opposite side of the room to find five more slot machines. Destroy their screens to unlock the achievement/trophy.
"Jungle Ghosts" You have to complete Mission 9: The Hunted without ever being spotted by an enemy to get the "Jungle Ghosts". During the first part of the mission, you are on your own. Stay to the left side of the area, and watch the radar. Nearby enemies will be shown with red dots on the radar. You can kill any necessary enemies. Remain crouched to avoid being noticed. While in the second area, you will see some burning rubble. Move slowly, and stay to the left side again until you reach your team. From this point on, you will only need to follow your teammates and do exactly what they say. If you are spotted at any point, just restart the checkpoint, and try again.
"Piece Of Cake" While playing Mission 11: Atlas Falls on the Veteran difficulty and after using the grapnel gun, you will have to kill tons of enemies and go to the common room. You must then breach the door. After the door has been breached, throw all your flashbangs and frag grenades to kill the enemies inside. Don't waste any grenades before reaching this room. If you do not kill all enemies with your grenades, you can simply let your teammates kill the rest of them. If you get hit at all, restart the checkpoint, and try again.
"They Look Like Ants" Near the conclusion of Mission 17: Loki you will be controlling weapons from space. You can see the exact blast radius when aiming. The ammo is infinite so you can shoot as often as desired. Kill the foot soldiers first before destroying the main targets. Make sure to carefully kill all enemies before destroying the final target. Do not aim anywhere near the allies or they will die. If you think you may have accidentally killed allies, simply restart the checkpoint, and try again.
"Tickets Please" After killing the first enemies in Mission 18: The Ghost Killer you will be attacked by many helicopters. Just after this, the grapple guys will climb up the train. There are four of them, but you only need to kill two of them to get the "Tickets Please". You have to kill them before they reach the top of the train. If you fail to do this, restart the checkpoint, and try again.
"Sprinter" In Extinction mode, first destroy all 12 hives to unlock the computer that initiates the exfiltration countdown. The computer will spawn near the final hive, and all players have to activate it simultaneously. From then you will have 2 minutes and 30 seconds to get back to the helicopter in the starting area. Meteorite barricades will block your way, but they will automatically fall apart after 30 seconds, and there are only two of them. You will also be attacked by several heavily armored Rhinos, so use armor breaking ammo to kill them. Fully upgraded sentry guns are recommended, as they distract and damage the Rhinos. If your health gets low, deploy fully upgraded armor vests. Armor can be very useful if you are running and a Rhino attacks you from behind. Make sure all players have armor vests in their loadout to avoid going down.
Destroy the three Extinction Hive eggs hidden in zone 2 (crater area) of the map to give all players speedy hand actions (reloading and setting turrets, seeing through walls) and turn enemies into mushrooms when killed.
This trophy requires that you find all intel in Mayday (Extinction mode) in the "Devastation" DLC. There are two types of collectibles that can be found in Mayday:
Classified intel These are obtained at random from searchable items, and their locations vary between every playthrough. You must collect a total of five of these types of intel to unlock them. Only one player can pick it up, and it will automatically unlock the intel in order. Any area can contain intel items, and an easy way to collect this type of intel is by playing solo in the first area and then purposely dying during the first drill section.
Encrypted intel These kind of intel take the form of laptops and are found throughout the Mayday map in the following locations. Note: You must complete Mayday to unlock the Epilogue intel. You can view your intel progress in the Extinction main menu, and there is a tracker available in the top right corner of the screen showing how many items you have collected:
1. Sleeper Agent: Drill the upstairs door in the first area and shoot out the window. Once done, walk onto the pipe and follow it to the left to find the laptop.
2. Encrypted: The laptop is on the balcony close to the Tesla/HypnoTrap schematics table after clearing the tentacle.
3. Witchcraft: The laptop is in the center of Area 2 on top of some crates. Use the crates to jump to the top.
4. Mutiny: After entering the indoor area on the top deck, check the back of the room behind the large cyclindrical column.
5. The Guardian: In the final area, check the opposite side of where you enter on the walkway.
There is hidden music that plays during the Federation Day level of the campaign. After rappelling down the building, head downstairs into one of the office sections of the building and kill the enemies. Listen carefully to hear an instrumental version of the song that plays at the end of the game, by Eminem. It is easier to hear if you have a nice headset, so be sure to listen carefully.
On each of the new multiplayer maps is one of four Extinction egg hives. Shoot these in a PUBLIC multiplayer match to unlock the "Egg-stra XP!" trophy as well as 2,000 XP. View the following video to see the locations of all four egg hives:
Search the following locations and perform the corresponding tasks to find all the Rorke Files and unlock the "Audiophile" achievement/trophy:
HOW TO FIND
Mission 1: Ghost Stories
Upon finishing the space section sequence, you will gain control of a character on earth. While running and dodging the falling ground, enter the first house on the right with a car in the driveway. Enter the front door to find the file on the floor.
Mission 2: Brave New World
After shooting down the two enemy helicopters, you will get on a vehicle and arrive at the HQ. Go to the the third floor to find the file on a table below the terminals on the wall (the door to the balcony will be on the right).
Mission 3: No Man's Land
After reaching the area with the yellow crane after controlling your dog for the second time, proceed forward until you enter a gray building to find the file on a desk, below the hanging monitor.
Mission 4: Struck Down
Once you breach into the baseball locker room, immediately turn left to find the file.
Mission 5: Homecoming
When starting the mission, after entering the first building and reaching stairs, turn left before going up to find the file on the desk in that room.
Mission 6: Legends Never Die
After getting past the flooded streets and entering a new interior through a wrecked walkway, kill the two enemies. Then, go to the desk where they were standing to find the file.
Mission 7: Federation Day
After cutting the window to make an entrance, go left as you enter the first hallway. Once done, enter the first open doorway on the left to find an office with the file on a desk inside, in the back right corner.
Mission 8: Birds Of Prey
When you enter a room where Rorke is waiting later in the mission, quickly grab the file on the desk before the mission transitions into another part.
Mission 9: The Hunted
After the crash landing sequence, you will eventually meet up with your lost squad again. In the area you find them, follow the stream of water on the left up to a waterfall. The file is on a rock to the left of the stream, near the waterfall.
Mission 10: Clockwork
When starting the area where you must use night-vision goggles and fight through the security checkpoint, look down the hallway to see the file through the window.
Mission 11: Atlas Falls
After entering a chamber where you are ordered to interact with the control room, before deactivating the regulators, look on the right to find a side room with the file inside.
Mission 12: Into The Deep
When the LSC is destroyed, you will have to escape sinking debris, and eventually reach a shipwreck. Just when you reach the enemy ambush, swim to the ocean floor to find file on a rock.
Mission 13: End Of The Line
After reaching a silo and are ordered to take a picture, after going through the door with "Mantengase Alejado" on it, just go down the stairs on the left, and turn left at the bottom of the stairs to find the file.
Mission 14: Sin City
After going through the large mall and reaching the slot machines, an ally will lift up a shutter for you to crawl through. Then, turn left to find the file on a table next to the couches.
Mission 15: All Or Nothing
Just after the mission starts and you put on the ghost mask, turn around to find the file on one of the lower bunks, in the left row.
Mission 16: Severed Ties
After launching the rockets, an ally will lead you downstairs and open a door. After going through the doors, go down the hallway on the right, and enter the first door on the left to find the file on a terminal in the corner.
Mission 17: Loki
After there is an explosion and you float through a tube, you will enter an open area in space. The file is floating in mid-air to the right of the big bronze solar panel.
Mission 18: The Ghost Killer
When the mission starts, quickly turn around, and look to the right to find the file on a red tool chest, near your vehicle.
First, choose "Weapon Challenges" and see if the "Chrome Barrel Master" challenge is active. If it says "Challenge Inactive", enter "Operations" and use a Squad Point to get new challenges. Keep doing this until the "Chrome Barrel Master" challenge is active. Once done, complete the "Chrome Barrel Master" challenge to unlock the Ghillie suit.
Zelda and Doctor Who During the “Federation Day” campaign mission, after you enter the “CARANI” door, you can find a trophy in the shape of The Doctor's TARDIS with the words "Award for Largest Interior with Smallest Exterior", and next to it a Zelda rupee-shaped trophy with the words "for most bushes cut and pots smashed". There's also a trophy poking fun at the whole "world ending in 2012" event.
Modern Warfare During the mission "Atlas Falls" you will breach a recreational room. Search around to find an arcade machine called Call of Duty: Modern Warfare.
Teddy bear On the Flooded map, go to the center of the map and stand on the roof of a submerged bus. Look to the north to find a vent, then climb it and a teddy bear can be seen at the top, tucked between the vent and the wall.
Saving Private Ryan While playing the mission "All or Nothing" you come across a soldier about to be executed. If you kill every enemy around him you will be "Saving Pvt Ryan", a reference to the movie.
Star Wars Eventually (in the campaign) you will be tasked with sinking a ship with a Remote Controlled Torpedo. If you fail the first try, you will be told to "Aim for the thermal exhaust port", which is similar to what is told to Luke Skywalker and other pilots when setting out to destroy the first Death Star.
Platoon The father in the campaign is named Elias, just like Sgt. Elias out of the movie Platoon. Also, Rourke highly resembles Sgt. Barnes, with his dew rag and big scar running along his face.
Three Wise Monkeys In the perks menu under the Stealth category, the first three perks have icons with an X, representing no sound, no sight, and no hearing. This is similar to the Three Wise Monkeys, who are most famous for the proverb they are in which involves them "Seeing no evil, hearing no evil and speaking no evil".
On the "Exodus" map in Extinction mode, move to the gas station area and find the dim neon sign above the car wash near one of the craters on the street. Shoot the letters on the sign to spell "NEVERSOFT"; each correct shot will display a colored letter on your HUD. Once the word is completed, you will unlock an "Always Hard" bonus video at the "Intel" menu that shows Neversoft's last day as a game studio.
Collect the three Neversoft eyeballs that randomly spawn to have the aliens on the map burst with the Neversoft logo eyeball when shot, and your team will become get the Guitar Hero Star Power. Lighting will strike the entire team, and glowing neon stars will drop down for ten seconds. Note: View the video to see the location of the eyeballs.
While playing Chapter 1: Point Of Contact in Extinction mode, grab the sniper rifle and find the "Gil's Lodge Motel" neon sign in the first area of the game. Shoot the letters "L", "O", and "L" (in order) in the word "Lodge" on that sign with the sniper rifle. If done correctly, the message "LOL" will appear in the center of the screen and any alien shot will temporarily explode into golden stuffed alien dolls. Note: This doesn't always work.
Play the single player Campaign mode under the Regular or higher difficulty level and complete the following missions to unlock the "Extinction Mode" option at the main menu: "Ghost Stories", "Brave New World", "No Man's Land", and "Struck Down" . You can also start Multiplayer Career mode and reach level 5.