Ankle deep in the dead.
Finish the Dead Pixels on Easy or higher.
Waist deep in the dead.
Finish the Dead Pixels on Normal or higher.
Shoulder deep in the dead.
Finish the Dead Pixels On Hard or higher.
Buried in the dead.
Finish the Dead Pixels on Hardest.
Bloodbath.
Reach a kill combo of 40.
It's a beginning.
Get 1968 kills.
Chunks of zombies everywhere!
Kill 10 zombies with a grenade.
50,000 volts.
Shock 150 zombies.
Kill it with fire.
Set 150 zombies on fire.
Corpsicles.
Freeze 100 zombies.
Saving ammo.
Kill 60 zombies with melee attacks.
Nice shot.
Kill 5 zombies with one shot.
It's the humane thing to do.
Picked clean
Empty 300 buildings of items.
It don't belong to me.
Complete a game without raiding a building.
Two against the world.
Finish a co-op game on any difficulty.
True ending.
Finish the solution game mode on any difficulty.
Master of all skills.
Max level all skills.
Supply and demand
Sell a wanted item to a trader
If you've got the cash.
Spend over a million dollars in trader stores.
Pack mule.
Walk across an entire street over encumbered.
Back from the dead, but in a good way.
Resurrect a player in coop.
The Sergeant.
Kill the ex-army sergent in the orginal game mode.
The Experiment.
See the medical experiment die in the orginal game mode.
The Husk.
Kill the burning husk in the orginal game mode.
The Queen.
Kill the Queen of spitters in the orginal game mode.
The Fiend.
Kill the clawed fiend in the orginal game mode.
The Infected.
Kill the infected survivor in the orginal game mode.
Better than the guy that made the game.
Survive 10 waves in the Last Stand Survival mode.
Time attack
Complete a Last Stand time attack game.