Answer 20 trivia questions correctly.
Defeat 25 enemies with the bazooka.
Defeat 25 enemies with the grenade launcher.
Beat the game, save the world.
Defeat 25 enemies with the shotgun.
Defeat 25 enemies with the Uzi.
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.
Defeat 25 enemies with the minigun.
Answer 10 trivia questions correctly.
Defeat 25 enemies with the hand gun.
Defeat 25 enemies with the assault rifle.
Defeat 25 enemies with Gorbachev's blowgun.
Answer 3 trivia questions correctly.
Defeat 25 enemies with the silencer pistol.
Defeat 25 enemies with Reagan's katana.
Finish any level in less than 20 seconds.
Complete a level without setting off any alarms.
Complete a level.