Busy, busy, busy
Not unlocked yetFinish 75 quests cumulatively.
Learning the ropes
Not unlocked yetReach level 10.
Dedicated student
Not unlocked yetReach level 25.
School of hard knocks
Not unlocked yetReach level 50
First!
Not unlocked yetKill a Suicider with a grenade.
Knock, knock
Not unlocked yetBreach a locked door with the first blow.
Gotta find'em all
Not unlocked yetFind 60 collectibles.
Nearly there
Not unlocked yetFind 120 collectibles.
Steam Punk
Not unlocked yetCreate weapons to rival the gods of fire or thunder.
Light my fire
Not unlocked yetSet 10 zombies on fire simultaneously.
Savior
Not unlocked yetSave 5 people besieged by zombies.
Need a hand?
Not unlocked yetJoin another player's game.
Warranty Void if Used
Not unlocked yetCreate a customized weapon.
Rageman
Not unlocked yetKill 100 enemies with Fury attacks.
People Person
Not unlocked yetPlay with 10 different co-op partners for at least 15 minutes each.
Menage et Trois
Not unlocked yetComplete 5 quests with 3 co-op partners.
Originality
Not unlocked yetPlay in a co-op team of 4 different playable characters.
Together in the light
Not unlocked yetComplete 5 quests in a single co-op game with the same partners.
Going steady
Not unlocked yetComplete 25 quests while playing with at least one co-op partner.
10 heads better than 1
Not unlocked yetKill 10 zombies in a row with headshots.
A taste of everything
Not unlocked yetKill a zombie with 10 different melee weapons.
To put it bluntly
Not unlocked yetKill 250 zombies using blunt melee weapons.
Hack & slash
Not unlocked yetKill 250 zombies using edged melee weapons.
Guns don't kill but they help
Not unlocked yetKill 250 zombies using firearms.