Complete the game in co-operative mode

Complete the game as Night Owl

Complete the game as Rorschach

Perform all 8 Rorschach combos within 60 seconds

Perform all 8 Night Owl combos within 60 seconds

Take down 10 enemies in a row finishing off each of them before doing a damage to anybody else

Eliminate an enemy that your partner has knocked down or thrown in your direction

Hit 14 enemies with a single electrify armor blast

Complete chapter 3 without hitting any ladies before they hit you

Hit at least 4 different enemies while building up a combo

Sustain a single rage mode for 60 seconds

String a single uninterrupted combo that's at least 10 hits long