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