Complete each achievement to get the allotted gamerscore. The numbers between the () is the points given for each achievement.
| Achievement | How to unlock |
|---|
| Alien in Training (5) | Complete Level 1-1 of the game. |
| Hungry Yeti (10) | Eat 50 KGB Agents with the Yeti. |
| City Destroyer (10) | Destroy 25 buildings during one game. |
| Juvenile Alien (10) | Complete the Game on Easy Difficulty. |
| Adult Alien (15) | Complete Game on Medium Difficulty. |
| Expert Alien (20) | Complete the Game on Hard Difficulty. |
| Head Chomper (20) | Head bite 50 enemies without touching the ground or firing. |
| Killing Spree (15) | Kill 1000 enemies during one game. |
| Mad Hatter (20) | Unlock all of the 31 hats that are in the game. |
| Perfect Fight (30) | Defeat the Final Boss without using a continue. |
| Survivalist (25) | Survive any challenge mode for 20 minutes. |
| WMD (20) | Reach 5000 Km in Super Soviet Missile Mastar. |
Verified by: this cheat is unverified
Submitted by:
Krunal on September 18, 2009
Unlockable hats
To unlock each hat do the following.
Note: You must finish the level for it to unlock just doing the task isn't enough.
Area 51 agent hat - Beat 3-2
Black Afro - Beat 1-5
Blond Wig/Pearls - Beat 1-2
Brown Hair - On hard, jump off the spaceship before the screen fades after beating the final boss
Brown Hat - In 2-5, kill 7 birds
Brown Wig/Pearls - Beat 1-3
Chef Hat - Beat 1-3
Conical purple hat - In 1-3 destroy "Castle of Crap" building
Crown of Flowers - 1-1 with gore off
Daisy-petal - Beat 2-3
Jester's Cap - Beat 3-4 on hard
Jheri Curl - In 1-4 destroy "fish are like plants" building
KGB Agent hat - Beat 2-1
Nurse Cap - In 3-5, get to final boss (don't have to win)
Pirate Hat - 1-1 destroy "Hairy Mommy Daycare"
Private Eye hat - Beat 3-2 on hard
Red Bandana - Beat 1-4
Rooster Hat - In 1-4 destroy the Behemoth-logo building(must be out of tank)
Stove Pipe Hat - 1-1 with gore off
Tiara - 2-2 on hard
Yellow Shark Fin - In 2-4 dig/suffocate before riding snowmobile
Verified by: this cheat is unverified
Submitted by:
Arcanium on August 06, 2007
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