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.
Got a headshot on a Heavy Armour Zombie without removing his helmet first
Hunted down every last hidden Gold Bar
At least 500 Skeletons destroyed
Fired shots over 50km in total
Put the tortured souls in the Forest out of their misery
Performed unlikely yet successful surgery
Landed the final blow on at least 20 Super Elites in co-op
Helped out companions under direct enemy attack at least 50 times
Revived injured companions at least 50 times
Got at least 20 enemies with one explosion
Army of Darkness completed
Spotted and destroyed every Bottle of Blood
The Keep completed
Answered a phone call from Hell. It was a wrong number
Forest of Corpses completed
Got at least 15 enemies with one explosion
Retrieved hot goods from a Chainsaw Elite
Freight Train of Fear completed
Played as every playable character
Shot a Suicide Zombie's grenade – that'll teach him
City of Ashes completed
Investigated a possessed doll and lived to regret it
Committed foul murder
Tower of Hellfire completed
Terminal completed
Crucible of Evil completed
Engaged in a 4-player co-op game and beat a Campaign level
Gateway to Hell completed
Lightened a Super Elite's wallet
Purgatory completed
Over 1,000 limbs lopped
Raised your Chain Count to at least 30
Raised your Chain Count to at least 20
Subway to Hell completed
Sent an Occult General back to Hell
Killed at least 5 enemies with one sniper bullet
Library of Evil completed
Labyrinth of Death completed
Killed at least 20 enemies while incapacitated
Cathedral of Resurrection completed
Showed a Zombie Sniper how it's done – got him in mid-air
Prevented at least 20 enemies from getting up
Raised your Chain Count to at least 10
Village of the Dead completed
Acquired a Panzerfaust
Acquired the Preacher
Put the boot into at least 50 enemies
Got at least 10 enemies with one explosion
Successfully complete all Chapters on Sniper Elite difficulty
Shoot the 3 Zombie Ravens outside the Folterschloss
Kill 5000 enemies of any kind
Kill 100 Zombie Snipers
Kill 50 Suicide Zombies
Kill 50 Super Elites
Kill 25 Fire Demons
Kill 25 Summoners
Sever 10,000 limbs
Get an unbroken 10-headshot streak
Defeat 500 enemies with headshots
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
Complete every Survivor sidequest
Reach at least Wave 10 in Horde Mode – Dead End
Reach at least Wave 10 in Horde Mode – Dead Man's Bluff