Defeat Abstract Daddy.

Play with 10 different co-op partners for at least 15 minutes each.

Complete act II.

Save 5 people besieged by zombies.

Complete 5 quests in a single co-op game with the same partners.

Kill 5 Infected in a row with a single blow.

Join another player's game.

Sever 100 limbs.

Breach a locked door with the first blow.

Travel a distance of 20 kilometers on foot.

Kill a zombie with 10 different melee weapons.

Meet 10 or more unique travelers.