Purchase all abilities for all character classes.

Revive 31 teammates (lifetime)

Complete the third mission of the U.S.S. campaign.

Infected 13 times (lifetime)

Kill 100 zombies with CQC (lifetime)

Purchase all abilities for one character class.

Kill 5 enemies while using a zombie as a shield.

Kill an infected teammate with a headshot before they become a zombie in any mode.

Witness the beginning of the Raccoon City outbreak.

Cleared HARD Time Attack in Challenge Mode.

Clear a Challenge in Challenge Mode.

Unlock all characters.

Perform 365 flashy background finishes.