At the start of "The Duke Dome" chapter, you will get an infinite amount of explosives when entering a building. Throw a trip mine directly on one of the enemies to earn the "Sticky Bomb Like You!" achievement.
In the "Titty City" chapter, there are two ATM machines; one near the bar and one near the slot machines in the game room. Go up to one and use it. It will say "card read error". Press action again and it will say "Feed me a stray cat" --a reference to the scene in American Psycho where Patrick Bateman tries using an ATM machine and it appears to him to say "Feed me a stray cat".
After loading up the Chapter called "Duke Nukem's Titty City", go behind the Bar on that level to find a closed Door that requires a code to be opened. The Code is: 4768. Inside you'll find a beer, which is part of the "Party Animal" achievement and a porn film starring the Dukester himself.
In the level "Duke Nukem's Titty Club," go through the Restrooms halfway and on the left side take a door with an "EXIT" sign over it. Head upstairs until you reach a small room. At the end of it a desk with a surveillance monitor on it and, next to it, the "Totem" from the movie "Inception" spinning without stopping.
Unlock the following accessories in the changing room by completing the corresponding multiplayer weapon challenges:
ACCESSORY - CHALLENGE Backwards Baseball Cap - Get 250 kills with the Shotgun (Burger Face III). Baseball Cap - Get 75 kills with pipe bombs (Splatter king III). Brain Sucker - Get 250 kills with the Enforcer (Laser Seeking Missiles III). Canadian Flag Logo - Get 75 kills with the Garter Pistol (Tiny But Deadly III). Cheese Hat - Get 250 kills with the Ripper (Swiss Cheese III). Detonator Logo - Get 250 kills with the Rocket Launcher (Boom Goes the Weasel III). Hoplite Helmet - Get 75 melee kills (Punchy McPuncher III). I Shot Stupid Logo - Get 250 kills with the Railgun (Right In the Eye III). Jester Hat - Get 75 kills with trip mines (Watch your step III). Military Hat - Get 250 kills with the Pistol (Size Doesn't Matter III). Retro Duke Logo - Get 250 kills with the Devestator (Meat Grinder III). Ski Goggles - Execute a frozen player 75 times (Ice to See You III). Tie-Dye Shirt - Get 250 kills with the AT laser (Medium Rare III). Uncle Sam Hat - Stomp on 75 enemies (Pee Wee Vermin III). Wolf Logo - Get 75 kills with Steroids (Roid Rage III). WTF Logo - Get 75 kills with exploding barrels (Smile You Son of a Bitch III).
You can find poop in toilets. There is some poop in the toilets in the room where the game begins, in the "Duke Lives" chapter. Grab some poop from a toilet and throw it to earn the "Turd Burglar" achievement.
Pinball games are located in various locations throughout the game. The first pinball game is found in "The Duke Cave" chapter. To speed things up while playing the pinball game, get at least a x2 multiplier without wasting a ball. Hold the top left flipper and bring the ball up there. Then, immediately release the flipper and let it hit the three panels. If the ball is getting too far on the right side, you can tilt the table to the left. Repeat this method without using the tilt ability more than once every five seconds. If you use it too often, you will lose control over the flippers.
The first helmet is at the very start of the "Vegas In Ruin" chapter, in the back of a vehicle. The second helmet is at the start of "The Hive" chapter; turn left after going through the first alien hole to find it. The third helmet is located in the "Blowin' The Dam" chapter; after planting the first bomb and fighting two octopuses, swim to some debris to your left to find it and unlock the "Bucket Head" achievement.
There are 28 Ego Awards. There are a few extra rewards that are gained automatically by playing through the story. If you get all Ego Awards during your first playthrough, you will unlock the "I Am All That Is Man" achievement in the "Blowin' The Dam" chapter.
In "The Shrunk Machine" chapter, near the start and after entering the first large room, straight ahead across the room are some double doors. Look at all pages on the calendar on the wall behind the double doors to unlock the "I Need A Date" achievement. There is another calendar in Part 2 of "The Forkstop" chapter on the wall in one of the rooms.
In the "Duke Nukem's Titty City" chapter, drink all nine beers in the strip club to unlock the "Party Animal" achievement. One beer is behind the locked door; the code is "4768". Get all the other items required to continue the chapter. After giving the items to the stripper, you can enter the last room.
A great opportunity to kill three aliens at once is early on when you must destroy the large ship with the laser gun on top of dukes building. After firing on the ship twice, two alien carriers will take position in front of you. Immediately fire at the ship (not the aliens) and they will all blow up with the ship.
In the "Damn It’s Late" mission, you will see an actor yelling at someone once you walk off the set. He says things like "You're a nice guy, you really are but you're a fucking amateur" and "Do you want me to trash you're mics? DO YOU?".This is a reference to when Christian Bale yelled at a crew member on the set of Terminator Salvation.
To defeat the energy leech, keep the freeze ray on you from the previous level. As soon as the fight scene with the leech starts, it will slam its body on the sea bed. When this happens, zap the leech with the freeze ray and the leech's energy will be reduced down to the red, so you will only need 1 hit with the RPG to finish this beast off.
ACHIEVEMENT - HOW TO UNLOCK A Good Dam Fight - Defeat the Battlelord on the Hoover Dam. Air-Duke - Win air hockey with a score of 7-0 in the strip club. Annihilation - Kill 100 aliens. Balls of Steel - Earn a 1,000,000 pinball score in SP. Baron von Nukem - Shoot down 20 alien fighters. Beating the One-Eyed Worm - Defeat the Energy Leech. Big Guns, Big Ships - Blow up 5 enemy gunships or dropships. Bucket Head - Find all 3 helmets in the SP campaign. Call Waiting - Listen to all phone messages. Come Get Some - Complete the SP campaign on Hard Difficulty. Companion Barrel - Unlock the secret closet at the end of the Forkstop. Damn, I'm Good - Complete the SP campaign on Insane Difficulty. Dead Useful - Kill 10 aliens with environmental explosives. Drawrings - Doodle something on the whiteboard in SP. Duke Angry, Duke Smash! - Kill 15 aliens with melee attacks while on steroids. Extermination - Kill 50 aliens. Flagon of Chuckles - Drink a beer in SP. Fork the Pork - Kill 6 aliens with the forklift. Freeze Well! - Kill 15 frozen aliens. Full Body Tourettes - Get knocked down 10 times. Gunslinger - Carry the gold pistol through the whole SP campaign. He's Got a Hologram! - Use a Holoduke in SP. Hippy-Stomper - Foot stomp 12 aliens. I Am All That Is Man - Discover all ego cap rewards. I Need a Date - Look at every page of a calendar in SP. I Need a Towel - Get hit by 10 Pregnator bombs. Judge, Jury, Executioner - Execute 20 aliens. Juiced - Take steroids in SP. Let's Rock - Complete the SP campaign on Normal Difficulty. Lots of Whacking - Win a game of Alien Abortion in the strip club. Natural Disaster 3x - Kill 3 aliens at once. Nobody Likes a Whiner - Knock out the talent at the talk show. Noms - Eat 10 pieces of food during the SP campaign. Not Bad for a Human - Defeat the Alien Queen. Nuclear Devastation - Kill 250 aliens. Octacide - Defeat the Octaking. On the Noggin' - Kill 30 aliens with headshots. One-Eyed Freak - Defeat the Cycloid. Party Animal - Drink all of the beers in the strip club. Pescaphobe - Kill all of the catfish in the underwater level. Piece of Cake - Complete the SP campaign on Easy Difficulty. Pit Champion - Defeat the Battlelord in Las Vegas. Road Rage - Kill 15 aliens with the monster truck. Special Thanks - Watch the credits all the way through. Sticky Bomb Like You! - Put a Trip Mine on a live alien. Substance Abuser - Drink beer while on steroids or vice-versa in SP. Sunday, Black Sunday - Shoot down the blimp above the stadium. Tosser... in the Literal Sense - Kill 10 aliens with tossed objects. Trapper - Kill 10 aliens with trip mines. Turd Burglar - Find and steal a piece of poo.
"The Doctor Who Cloned Me" achievements ACHIEVEMENT - HOW TO UNLOCK Another Piece of Cake - Beat the DLC campaign on Easy Difficulty. Bloody Red Rover - Kill 30 enemies with the moon rover. Bubble Buster - Kill 10 expanded enemies with melee attacks. Come Get a Little More - Beat the DLC campaign on Hard Difficulty. Damn, I'm REALLY Good - Beat the DLC campaign on Expert Difficulty. Heart to Heart - Finish Doctor Proton. Hedonist, not Misogynist - Discover and reject the video game that lets you slap women. I Am All That Is Man - Again! - Discover all Ego cap rewards in the DLC campaign. Let's Rock Out - Beat the DLC campaign on Normal Difficulty. Passive Aggressive - Let 20 enemies die by someone else's hand. Scientits - Earn a 1,000,000 pinball score on the Scientits pinball machine. Threesome - Kill 3 enemies within 3 seconds with the Impregnader.
Complete the game under Normal difficulty or higher to unlock the following cheat options:
Concept Arts Development Timeline Duke 3D Freeze Ray (freeze ray fires bouncing ice projectiles) Duke Sound Board Game Speed (adjust game speed) Grayscale Mode (black and white graphics) Head Scale (adjust head size of enemies and NPCs) - Easy difficulty or higher. Infinite Ammo (cheat; self-explanatory) Instagib (cheat; enemies killed with one shot and always gib) Invincibility (cheat; no damage from bullets or explosions) Mirror Mode (graphics are mirrored horizontally) Movies Screenshots Triptych Office Photos
In "The Hive," after opening a couple alien doors, you will encounter a room with tons of spore-looking things near the doorway. Take a left, then turn on your Duke Vision and crouch, under the branch like things. Then, at the end of the cave you ducked through, there is a dead EDF marine. Walk up to him to have Duke say "Thats one dead space marine." His helmet looks a lot like Isaac Clark's helmet from Dead Space.
At the start of Vegas in Ruins, the 'power armor' in the armor crate at the beginning of the level is none other than that of a Spartan -- and Master Chief's classic green and orange color scheme, no less.
In the "Duke Nukem's Titty City" chapter, play a game of air hockey in the game room at the back of the club. However, rather than focusing on scoring, try defending your goal as best you can. The rest will happen by accident since the opponent is very weak.
In Part 2 of "The Forkstop" chapter, you will come across a large area where you must turn the power on. After killing a few waves of enemies, use the forklift and climb the wall to your right. Grab the heart barrel, and go to the other side. Place the barrel on the blue heart drawing on the ground to open the secret room and unlock the "Companion Barrel" achievement.