Complete an online co-op game.
Beat 10 opponents in online versus mode.
Beat another player in an online versus match.
Beat the game without continuing.
Beat the fourth boss.
Kill 10 enemies without losing your weapon.
Beat the first boss without dying.
Wield the pipe in single-player or co-op mode.
Wield the knife in single player or co-op mode.
Score 800,000 points in one game -- with Game Settings set to Hardcore.
Defeat Boss 'Jet' at the end of Stage 2 -- with Game Settings set to Hardcore.
Beat the game without using a special attack.
999
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