Kill Jet
You defeated Jet and reached Stage 3 -- with Game Settings set to Hardcore.
30 ✓ October 9th, 2007
Psycho
You killed 10 enemies without losing your weapon.
15 ✓ September 1st, 2007
Perfect Boss
You beat the first boss without dying.
10 ✓ January 1st, 1753
Fourth Boss
You beat the fourth boss.
10 ✓ September 1st, 2007
First Versus
You won an online versus match.
10 ✓ September 3rd, 2007
Online Co-op
You completed an online co-op game.
10 ✓ September 1st, 2007
Pipe Wielder
You wielded the pipe in single-player or co-op mode.
5 ✓ September 1st, 2007
Knife Wielder
You wielded the knife in single-player or co-op mode.
5 ✓ September 1st, 2007
Perfect Win
You beat the game without continuing.
40 
Hard Win
You beat the game without using a special attack.
35 
High Score
You scored 800,000 points with Game Settings set to Hardcore.
25 
Online Warrior
You have defeated 10 opponents on Xbox Live in versus mode.
5