Smash 20 Kleers with the Sledgehammer.
Kill the kicked enemy while it is still in the air.
Find Sam's classic outfit.
Complete the single player campaign.
Awake the Guardian of Time.
Blow a Major Biomechanoid into pieces.
Power up the Timelock.
Perform all possible finishing moves in the game.
Rip Scrapjack's head off.
Kill an enemy using the Mutilator.
Solve the riddle of the Sphynx.
Kill 20 enemies with the Minigun without releasing the trigger.
Secure the bird.
Kill at least 5 headless kamikazes in one explosion.
Rescue professor Stein. So to say.
Complete any level in single player.
Complete the game in single player on unmodified serious difficulty.
Find at least 50 secrets in single player.
Complete the campaign in cooperative with at least 2 players.
Decapitate a Khnum.
Complete the Jewel of The Nile single player campaign.
Win a versus match.
Win 10 deathmatch games.
Score a total of 10 points in CTF matches.
Make at least 3 kills in one Instant Kill match.
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