Adult Alien (15) - Complete the Game on Medium Difficulty.
Alien in Training (5) - Complete level 1-1 of the game.
City Destroyer (10) - Destroy 25 buildings during one game.
Expert Alien (20) - Complete the Game on Hard Difficulty.
Head Chomper (20) - Head bite 50 enemies witout touching the ground or firing.
Hungry Yeti (10) - Eat 50 KGB Agenst with the Yeti.
Juvenile Alien (10) - Complete the Game on Easy Difficulty.
Killing Spree (15) - Kill 1000 enemies during one game.
Mad Hatter (20) - Unlock all of the 31 hats that are in the game.
Perfect Flight (30) - Defeat the final boss without using a continue.
Survivalist (15) - Surive any challenge mode for 20 minutes.
WMD (20) - Reach 5000 Km in Super Sovjet Missile Master.
Area 51 Agent Hat - Beat Level 3-2
Black Afro - Beat Level 1-5
Blonde Wig w/ Pearls - Beat Level 1-2
Brown Hair - On Hard, jump off the spaceship before the screen fades after beating the final boss
Brown Hat - In Level 2-5, kill seven birds
Brown Wig w/ Pearls - Beat Level 1-3
Chef Hat - Beat Level 1-3
Conical Purple Hat - In Level 1-3, destroy "Castle of Crap" building
Crown of Flowers - Beat Level 1-1 with gore off
Daisy-petal - Beat Level 2-3
Jester's Cap -Beat Level 3-4 on Hard
Jheri Curl - In Level 1-4, destroy "Fish Are Like Plants" building
KGB Agent Hat - Beat Level 2-1
Nurse Cap - In Level 3-5, get to final boss
Pirate Hat - In Level 1-1, destroy the "Hairy Mommy Daycare" building
Private Eye Hat - Beat Level 3-2 on Hard
Red Bandana - Beat Level 1-4
Rooster Hat - In Level 1-4, destroy the Behemoth-logo building (you must be out of tank)
Stove Pipe Hat - Beat Level 1-1 with gore off
Tiara - Beat Level 2-2 on Hard
Yellow Shark Fin - In Level 2-4, dig in the ground right before riding the snowmobile
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