Kill 13 zombified teammates.

31 Parasites killed (lifetime)

Complete an Echo Six Expansion mission with no human player incapacitated from death or infection.

Beat an Echo Six Expansion Pack mission with the 3 male characters in your party.

As Tweed, use C4 to open door in Foundry

Free teammate from Licker grapple.

Complete By the Trail of Our Dead

Beat an Echo Six Expansion Pack mission with the 3 female characters in your party.

Revive 31 teammates (lifetime)

Heal with 101 Green Herbs (lifetime)

Infected 13 times (lifetime)

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