Beat the game, save the world.
Answer 20 trivia questions correctly.
Finish a level without killing any enemies.
Discover a hidden room.
Destroy all of the fuel in the fuel depot.
Kill 20 or more enemies on any level.
Answer 10 trivia questions correctly.
Defeat 25 enemies with the assault rifle.
Defeat 25 enemies with Gorbachev's blowgun.
Defeat 25 enemies with Reagan's katana.
Finish any level in less than 20 seconds.
Defeat 25 enemies with the hand gun.
Answer 3 trivia questions correctly.
Defeat 25 enemies with the shotgun.
Defeat 25 enemies with the silencer pistol.
Complete a level without setting off any alarms.
Complete a level.
Defeat 25 enemies with the bazooka.
Defeat 25 enemies with the grenade launcher.
Defeat 25 enemies with the Uzi.
Defeat 25 enemies with the minigun.