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.