Bronze

Electric Explosion
Hit 14 enemies with a single electrify armor blast.

Primal Scream
Sustain a single rage mode for 60 seconds.

Ping Pong
Hit at least 4 different enemies while building up a combo.

Gentleman
Complete Chapter III without hitting the ladies before they hit you.

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

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

You Bag Em – I Tag Em
Eliminate 10 enemies that your partner has knocked down or thrown in your direction

Silver

Martial Artist
Perform all 8 Nite Owl combos within 60 seconds.

Feral Fighter
Perform all 8 Rorschach combos within 60 seconds.

Hero
Complete the game in Nite Owl mode.

Psycho
Complete the game in Rorschach mode.

Gold

Friends Forever?
Complete the game in Co-op mode.