Complete the Game on Medium Difficulty.
Complete level 1-1 of the game.
On hard, jump off the spaceship before the screen fades after beating the final boss.
Destroy 25 buildings during one game.
In 1-3 destroy "Castle of Crap" building.
Complete the Game on Hard Difficulty.
Head bite 50 enemies witout touching the ground or firing.
Eat 50 KGB Agenst with the Yeti.
In 1-4 destroy "fish are like plants" building.
Complete the Game on Easy Difficulty.
Kill 1000 enemies during one game.
Unlock all of the 31 hats that are in the game.
In 3-5, get to final boss (don't have to win).
Defeat the final boss without using a continue
1-1 destroy "Hairy Mommy Daycare".
In 1-4 destroy the Behemoth-logo building(must be out of tank).
Surive any challenge mode for 20 minutes.
Reach 5000 Km in Super Sovjet Missile Master.
In 2-4 dig/suffocate before riding snowmobile.