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Alien in Training

5
Complete Level 1-1 of the game.
Hungry Yeti

10
Eat 50 KGB Agents with the Yeti.
Killing Spree

15
Kill 1000 enemies during one game.
Juvenile Alien

10
Complete the Game on Easy Difficulty.
City Destroyer

10
Destroy 25 buildings during one game.
Survivalist

25
Survive any challenge mode for 20 minutes.
Perfect Fight

30
Defeat the Final Boss without using a continue.
Expert Alien

20
Complete the Game on Hard Difficulty.
Adult Alien

15
Complete Game on Medium Difficulty.
WMD

20
Reach 5000 Km in Super Soviet Missile Mastar.
Mad Hatter

20
Unlock all of the 31 hats that are in the game.
Head Chomper

20
Head bite 50 enemies without touching the ground or firing.
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