- Xbox 360
Achievements:
Hats
Complete the indicated task to unlock the corresponding hat.
Area 51 Agent: Complete level 3-2.
Black Afro: Complete level 1-5.
Blond Wig/Pearls: Complete level 1-2.
Brown Hair: Defeat the final Boss under the Hard difficulty, then jump off the spaceship before the screen fades.
Brown: Kill seven birds in level 2-5 then complete the level.
Brown Wig/Pearls: Complete level 1-3.
Chef: Complete level 1-3.
Conical purple: Destroy the "Castle of Crap" building in level 1-3 then complete the level.
Crown of Flowers: Complete level 1-1 with gore off.
Daisy-petal: Complete level 2-3.
Jester's Cap: Complete level 3-4 under the Hard difficulty.
Jheri Curl: Destroy the "Fish Are Like Plants" building in level 1-4 then complete the level.
KGB Agent: Complete level 2-1.
Nurse Cap: Reach the final Boss in level 3-5.
Pirate: Destroy the "Hairy Mommy Daycare" building in level 1-1 then complete the level.
Private Eye: Complete level 3-2 under the Hard difficulty.
Red Bandana: Complete level 1-4.
Rooster: Destroy the Behemoth logo building while out of the tank in level 1-4 then complete the level.
Stove Pipe: Complete level 1-1 with gore off.
Tiara: Complete level 2-2 under the Hard difficulty.
Yellow Shark Fin: Dig or suffocate before riding the snowmobile in level 2-4 then complete the level.
Achievements:
Complete the following achievements to unlock Xbox Live Gamerscore points.
Alien in Training (5 points): Complete level 1-1.
Hungry Yeti (10 points): Eat 50 KGB Agents with the Yeti.
City Destroyer (10 points): Destroy 25 buildings during one game.
Juvenile Alien (10 points): Complete the game on the Easy difficulty.
Adult Alien (15 points): Complete the game on the Medium difficulty.
Expert Alien (20 points): Complete the game on the Hard difficulty.
Head Chomper (20 points): Head bite 50 enemies without touching the ground or firing.
Killing Spree (15 points): Kill 1,000 enemies during one game.
Mad Hatter (20 points): Unlock all 31 hats.
Perfect Flight (30 points): Defeat the final Boss without using a continue.
Survivalist (25 points): Survive any challenge mode for 20 minutes.
WMD (20 points): Reach 5000 km in Super Soviet Missile Master.
Easy Survivalist and Killing Spree achievements:
Select the Area 51 Challenge. Start by killing everything in sight. Wait for the big metal robot to appear from the right. Do not destroy it. It does not kill you. As soon as it enters the screen, stand directly under it and start shooting in the opposite direction. You will kill everything that appears from the left side and the enemies jumping over the robot with ease. Keep this up for about twenty minutes to unlock both achievements at the same time