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.
At least 25 Summoners silenced
The Keep completed
Wiped out the tainted wildlife around the Folterschloss
Got a headshot on a Heavy Armour Zombie without removing his helmet first
Forest of Corpses completed
Helped out companions under direct enemy attack at least 50 times
Retrieved hot goods from a Chainsaw Elite
Put the tortured souls in the Forest out of their misery
Freight Train of Fear completed
Achieved an unbroken 10-headshot streak
Committed foul murder
City of Ashes completed
Investigated a possessed doll and lived to regret it
Tower of Hellfire completed
At least 500 Skeletons destroyed
Terminal completed
Landed the final blow on at least 20 Super Elites in co-op
Crucible of Evil completed
Answered a phone call from Hell. It was a wrong number
Gateway to Hell completed
Killed at least 20 enemies while incapacitated
Purgatory completed
Subway to Hell completed
Library of Evil completed
At least 50 Suicide Zombies denied
Labyrinth of Death completed
Raised your Chain Count to at least 30
Killed at least 500 enemies with headshots
Raised your Chain Count to at least 20
Over 1,000 limbs lopped
Showed a Zombie Sniper how it's done – got him in mid-air
Prevented at least 20 enemies from getting up
Cathedral of Resurrection completed
Sent an Occult General back to Hell
Put the boot into at least 50 enemies
Village of the Dead completed
Lightened a Super Elite's wallet
Acquired the Preacher
Shot a Suicide Zombie's grenade – that'll teach him
Got at least 10 enemies with one explosion
Got at least 15 enemies with one explosion
Raised your Chain Count to at least 10
Acquired a Panzerfaust
Successfully complete Army of Darkness
Successfully complete all Chapters on Sniper Elite difficulty
Save the man in the hospital
Complete any Campaign chapter in 4-player co-op at any difficulty level
Kill 5000 enemies of any kind
Kill 100 Zombie Snipers
Kill 50 Super Elites
Kill 25 Fire Demons
Get a 5-for-1 kill with any sniper rifle
Reach a total shot distance of 50km
Sever 10,000 limbs
Get at least 20 for 1 with an explosive kill
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
Revive other players 50 times
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