Knife WielderWield the knife in single player or co-op mode.
PsychoKill 10 enemies without losing your weapon.
Perfect BossBeat the first boss without dying.
Pipe WielderWield the pipe in single-player or co-op mode.
Fourth BossBeat the fourth boss.
Perfect WinBeat the game without continuing.
Hard WinBeat the game without using a special attack.
Online Co-opComplete an online co-op game.
First VersusBeat another player in an online versus match.
Online WarriorBeat 10 opponents in online versus mode.
Kill JetDefeat Boss 'Jet' at the end of Stage 2 -- with Game Settings set to Hardcore.
High ScoreScore 800,000 points in one game -- with Game Settings set to Hardcore.