Complete the tutorial.

Complete all U.S.S. missions on Veteran.

Kill 13 zombified teammates.

Fully upgrade all abilities for one character class.

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

Kill an enemy with each weapon type including special weapons.

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

Revive 31 teammates (lifetime)

Fully upgrade an ability.

Kill 5 enemies with Blood Frenzy in a single campaign game or multiplayer match.

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

Witness the beginning of the Raccoon City outbreak.

Kill 250 zombies using edged melee weapons.