Decipher an Egyptian text.
Complete the game in single player on unmodified serious difficulty.
Smash 20 Kleers with the Sledgehammer.
Kill at least 5 headless kamikazes in one explosion.
Find Sam's classic outfit
Kill 5 Cave Demons while they're in air.
Complete any level in cooperative with at least 2 players.
Secure the bird.
Kill an enemy using the Mutilator.
Find at least 10 secrets in single player.
Blow a Major Biomechanoid into pieces.
Power up the Timelock.
Kill a Witch-Bride of Achriman.
Solve the riddle of the Sphynx.
Use the Mutilator to surf after a Werebull.
Complete any level in single player.
Complete the game in single player in the estimated time on each level.
Awake the Guardian of Time.
Gib 20 enemies from close range with a shotgun.
Kill 20 enemies with the Minigun without releasing the trigger.
Rescue professor Stein. So to say.
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