Full list of all 68 Zombie Army Trilogy achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Prevented at least 20 enemies from getting up
Killed at least 500 enemies with headshots
Over 1,000 limbs lopped
Killed at least 20 enemies while incapacitated
Got at least 15 enemies with one explosion
Got at least 20 enemies with one explosion
Showed a Zombie Sniper how it's done – got him in mid-air
Cathedral of Resurrection completed
Raised your Chain Count to at least 30
Raised your Chain Count to at least 20
Got at least 10 enemies with one explosion
Put the boot into at least 50 enemies
Acquired a Panzerfaust
Raised your Chain Count to at least 10
Successfully complete Village of the Dead
Successfully complete Labyrinth of Death
Successfully complete Library of Evil
Successfully complete Subway to Hell
Successfully complete Purgatory
Successfully complete Gateway to Hell
Successfully complete Crucible of Evil
Successfully complete Terminal
Successfully complete Tower of Hellfire
Successfully complete City of Ashes
Successfully complete Freight Train of Fear
Successfully complete Forest of Corpses
Successfully complete The Keep
Successfully complete Army of Darkness
Successfully complete all Chapters on Sniper Elite difficulty
Kill an Occult General
Pick up the Preacher
Loot a Super Elite's corpse
Loot a Chainsaw Elite's corpse
Kill a Suicide Zombie by hitting his grenade
Headshot a Heavy Armour Zombie without removing his helmet
Become possessed
Pick up a phone
Save the man in the hospital
Put the tortured souls in the Forest out of their misery
Shoot the 3 Zombie Ravens outside the Folterschloss
Complete any Campaign chapter in 4-player co-op at any difficulty level
Kill a Survivor
Kill 5000 enemies of any kind
Kill 500 Skeletons
Kill 100 Zombie Snipers
Kill 50 Suicide Zombies
Kill 50 Super Elites
Kill 25 Fire Demons
Kill 25 Summoners
Get a 5-for-1 kill with any sniper rifle
Reach a total shot distance of 50km
Sever 10,000 limbs
Get an unbroken 10-headshot streak
Score 5,000 with a single sniper round
Reach at least Wave 10 in Horde Mode – Waves of Despair
Reach at least Wave 10 in Horde Mode – No Sanctuary
Reach at least Wave 10 in Horde Mode – Flood of Tears
Reach at least Wave 10 with the highest score in any Horde Mode map
Reach at least Wave 10 with more gold medals than your companions
Kill 50 enemies that are actively attacking other players
Revive other players 50 times
Kill 20 Elites in co-op
Complete every Survivor sidequest
Complete levels as every playable character
Collect every Gold Bar
Find and shoot every Bottle of Blood
Reach at least Wave 10 in Horde Mode – Dead End
Reach at least Wave 10 in Horde Mode – Dead Man's Bluff