Pipe Wielder

 

Wield the pipe in single-player or co-op mode

Knife Wielder

 

Wield the knife in single player or co-op mode.

Psycho

 

Kill 10 enemies without losing your weapon.

Perfect Boss

 

Beat the first boss without dying.

Fourth Boss

 

Beat the fourth boss.

First Versus

 

Beat another player in an online versus match.

Online Warrior

 

Beat 10 opponents in online versus match.

Online Co-op

 

Complete an online co-op mode.

High Score

 

Score 800,000 points in one game -- with Game Settings set to Hardcore.

Kill Jet

 

Defeat Boss 'Jet' at the end of Stage 2 -- with Game Settings set to Hardcore.

Hard Win

 

Beat the game without using a special attack.

Perfect Win

 

Beat the game without continuing.