Kill 500 enemy grunts

Kill 1000 enemies

Kill 5000 enemies

Kill any 100 enemy with the shotgun

Kill 20 enemies as they revive

Kill a suicide grunt by hitting his grenade

Kill 100 skeletons with explosives

Defeat the Final Boss

Pick up a shotgun

Pick up the Preacher

Successfully complete Chapter 1 with 4 players

Successfully complete Chapter 2 with 4 players

Successfully complete Chapter 3 with 4 players

Successfully complete Chapter 4 with 4 players

Successfully complete Chapter 5 with 4 players

Successfully complete All Chapters 4 players on Elite Difficulty

Get at least 10 for 1 explosive kill in 4 player co-op

Get at least 15 for 1 explosive kill in 4 player co-op

Get at least 20 for 1 explosive kill in 4 player co-op

Kick 50 enemies down in co-op

Kill 20 Snipers in co-op

Kill 2000 enemy grunts in co-op

Kill 20 Elites in co-op

Collect all Gold Bars

Find and shoot all the bottles of blood

Defeat a Fire Demon

Defeat 100 ignited zombies

Defeat 20 Summoners

Defeat 10 Fire Demons

Loot an Elite's corpse

Become possessed

Pick up a phone

Kill the trapped Elite

Defeat 500 enemies with headshots

Get a 5-for-1 kill with any sniper rifle

Own 2 Nazi Zombie Army games