First Versus (10) - Beat another player on Xbox Live in a versus match.
Fourth Boss (10) - Beat the fourth boss.
Hard Win (35) - Beat the game without using a special attack.
High Score (25) - Score 800,000 points in one game -- with Game Settings set to Hardcore.
Kill Jet (30) - Defeat Boss 'Jet' at the end of Stage 2 -- with Game Settings set to Hardcore.
Knife Wielder (5) - Wield the knife in single player or co-op mode.
Online Co-op (10) - Complete an online co-op game.
Online Warrior (5) - Beat 10 opponents on Xbox Live in versus mode.
Perfect Boss (10) - Beat the first boss without dying.
Perfect Win (40) - Beat the game without continuing.
Pipe Wielder (5) - Wield the pipe in single-player or co-op mode.
Psycho (15) - Kill 10 enemies without losing your weapon.
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