
Alien in Training (5) : Complete Level 1-1 of the game.
City Destroyer (10) : Destroy 25 buildings during one game.
Hungry Yeti (10) : Eat 50 KGB Agents with the Yeti.
Juvenile Alien (10) : Complete the Game on Easy Difficulty.
Adult Alien (15) : Complete Game on Medium Difficulty.
Killing Spree (15) : Kill 1000 enemies during one game.
Expert Alien (20) : Complete the Game on Hard Difficulty.
Head Chomper (20) : Head bite 50 enemies without touching the ground or firing.
Mad Hatter (20) : Unlock all of the 31 hats that are in the game.
WMD (20) : Reach 5000 Km in Super Soviet Missile Mastar.
Survivalist (25) : Survive any challenge mode for 20 minutes.
Perfect Fight (30) : Defeat the Final Boss without using a continue.


