ACHIEVEMENT - HOW TO UNLOCK Alien Tears - Earn a gold medal on all missions in the Story mode. Annihilator - Kill 10,000 aliens. Arsenal - Build 20 towers in one mission. Base Defender - Complete the Story mode. Boot Camp - Finish the first 3 missions. Burn Baby Burn - Build 5 Inferno towers. Circular Hazard - Earn a gold medal on the Campaign mode of Risk Exposure and Roundabout. Civil Divergence - Earn a gold medal on the Campaign mode of Urban Planning and Tactical Diversion. Close Call - Save a core less than 10 seconds away from the map exit. Combat Turmoil - Earn a gold medal on the Campaign mode of Service Interruption and Height of Confusion. Confident - Use speed up controls for a total of 30 seconds in any one mission. Death From Above - Fire the orbital laser. Diversity - Build all tower types in one mission. Eradicator - Kill 100 aliens. Exterminator - Destroy 1000 aliens. Few and Proud - Volunteered to take part and completed the mission! You may now recruit another group. Field Promotion - Earn at least one silver medal. Field Promotion - Earn at least one silver medal. Filthy Rich - Win with 10,000 resources remaining. Firebug - Beat an advanced mission with only Inferno towers. First Blood - Kill 1 alien. Flawless Victory - Earn at least one gold medal. Flurry - Earn a gold medal on an adrenaline challenge mode. Full Defense - Build 50 towers in one mission. Full House - Build all upgrades of all tower types in one mission. Full Potential - Beat an advanced mission with only level 3 towers and no selling. Great Ball of Fire - Build 5 Meteor towers. Gun Crazy - Beat an advanced mission with only Gun towers. Happy Returns - Recover a loose core. Head Trauma - Build 5 Concussion towers. Hey! That's mine! - Kill an alien carrying a power core. High Voltage - Build 5 Tesla towers. I Spy - Activate reconnaissance system. Indecisive - Sell 10 towers in a single mission. Kaboom! - Build 5 Cannon towers. Leadhead - Build 5 Gun towers. Liquidator - Sell 5 towers. Master Strategist - Earn a gold medal on all Challenge modes. Minimalist - Beat an advanced mission with only level 1 towers. Nail Biter - Win mission with the last core less than 10 seconds away from the map exit. No Sale - No towers sold in a single mission. Not So Fast - Build 5 Temporal towers. Out of Bullets - Beat all 5 "Out of Bullets" challenge modes without using Gun or Cannon towers. Overflowing - Earn a gold medal on all the modes of Overflow. Overseer - Build 5 Command towers. Penny Pincher - Win with 5,000 resources remaining. Pew Pew - Build 5 Laser towers. Planet Defender - Earn a silver medal on all missions in the Story mode. Power Builder - Build 6 towers within 10 seconds. Pyrrhic Victory - Shoot down flying alien carrying a core. Regional Deluge - Earn a gold medal on the Campaign mode of Kill Zone and Overflow. Relay Race - Witness 1 core handed off 10 times within 20 seconds. Retry - Reload an earlier save checkpoint. Salvage Rights - Destroy at least one boss alien. Sharpshooter - Shoot down a flying alien. Shell-shocked - Beat an advanced mission with only Cannon towers. Siege Breaker - Survive 100 waves on the Grinder challenge mode. Supreme Strategist - Earn a gold medal on any 150 missions in The Awakening campaign. Surplus - Win with 1,000 resources remaining. The Long Road - Alien time until exit exceeds 5 minutes. The Not-So-Friendly Skies - Build 5 Missile towers. Top of the Class - Earn a gold medal on all the modes of Tony's Training and C.H.A.S. Tower Expert - Build every tower and upgrade. Untouchable - Beat an advanced mission with zero cores captured. Well Invested - Gain 10000 resources from interest in a single mission. What IS that? - Inspect 10 aliens. Xenocide - Kill 50,000 aliens. Yellow Beats Green - Upgrade a tower.