If You complete the indicated task You'll get the allotted gamerscore.
Teamwork (36) - Complete the game in co-op mode.
Hero (36) - Complete the game in Nite Owl mode.
Psycho (36) - Complete the game in Rorschach mode.
Street Justice (36) - Complete the game as Rorschach.
Morally Superior (36) - Complete the game as Nite Owl.
Friends Forever? (36) - Complete the game in Co-operative mode.
Thief (15) - Find all abilities and pickups in Rorschach mode.
Detective (15) - Find all abilities and pickups in Nite Owl mode.
Martial Artist (15) - Perform all 8 Nite Owl combos within 60 seconds.
Feral Fighter (15) - Perform all 8 Rorschach combos within 60 seconds.
Focus Fire (11) - Take down 10 enemies in a row finishing off each of them before doing damage to anybody else.
Untouchable (11) - Go unharmed for an entire level, without restarting from a checkpoint.
Turbo (11) - Complete the game in less than 80 minutes in one session, without restarting from a checkpoint.
You Tag 'em - I Bag 'em (11) - Eliminate an enemy that your partner has knocked down or thrown in your direction.
Vigilante (8) - Eliminate 20 bad guys in 101 seconds.
Electric Explosion (8) - Hit 14 enemies with a single electrify armor blast.
Gentleman (8) - Complete Chapter III without hitting any ladies before they hit you.
Ping Pong (8) - Hit at least 4 different enemies while building up a combo.
Rrarararghgh!!! (8) - Sustain a single rage mode for 60 seconds.
Unending Combo (8) - String a single uninterrupted combo that's at least 10 hits long.
Exterminator (8) - Perform 250 finishing moves.
Retaliator (8) - Perform 200 counter attacks.
Shield (8) - Dodge or block 25 incoming attacks.
Strong Arm (8) - Knock 100 people over, by throwing other people into them.
Unlock "Rorschach VS Nite Owl" Mode
Complete part 2 to unlock "Rorschach VS Nite Owl" versus mode.