Kill 50 opponents in Versus. (lifetime)

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

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

Kill an enemy with each weapon type including special weapons.

Infected 13 times (lifetime)

Heal with 101 Green Herbs (lifetime)

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

Fully upgrade all abilities for one character class.

Fully upgrade an ability.

Kill 5 enemies while using a zombie as a shield.

Revive 31 teammates (lifetime)

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

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