Rorschach Versus Night Owl Mode:
To unlock Rorschach Versus Night Owl mode, beat the game.
You Tag 'em - I Bag 'em - Kill 10 enemies that your partner has knocked down or thrown towards you.
Focus Fire - Kill 10 enemies in a row finishing each one off without damaging another.
Unending Combo - String a single uninterrupted combo 10 hits long.
Gentleman - Complete chapter III without hitting the ladies until they hit you.
Ping Pong - Hit 4 different enemies while building up a combo.
Primal Scream - Sustain a single rage mode for 60 seconds.
Electric Explosion - Hit 14 enemies with an electrify armor blast.
Street Justice - Complete the game in rorschach mode.
Morally Superior - Complete the game in nite owl mode.
Martial Artist - Perform all 8 nite owl combos in less than 60 seconds.
Feral Fighter - Perform all 8 rorschach combos in less than 60 seconds.
Friends Forever? - Complete the game in co-op mode.