Morally Superior
Reward: 36 Points
Objective: Complete the game as Nite Owl.

Street Justice
Reward: 36 Points
Objective: Complete the game as Rorschach.

Martial Artist
Reward: 15 Points
Objective: Perform all 8 Nite Owl combos within 60 seconds.

Feral Fighter
Reward: 15 Points
Objective: Perform all 8 Rorschach combos within 60 seconds.

You Tag 'em - I Bag 'em
Reward: 11 Points
Objective: Eliminate an enemy that your partner has knocked down or thrown in your direction.

Focus Fire
Reward: 11 Points
Objective: Take down 10 enemies in a row finishing off each of them before doing damage to anybody else.

Electric Explosion
Reward: 8 Points
Objective: Hit 14 enemies with a single electrify armor blast.

Rrarararghgh!!!
Reward: 8 Points
Objective: Sustain a single rage mode for 60 seconds.

Ping Pong
Reward: 8 Points
Objective: Hit at least 4 different enemies while building up a combo.

Unending Combo
Reward: 8 Points
Objective: String a single uninterrupted combo that's at least 10 hits long.

Gentleman
Reward: 8 Points
Objective: Complete Chapter III without hitting any ladies before they hit you.

Multiplayer:

Friends Forever?
Reward: 36 Points
Objective: Complete the game in Co-operative mode