Full list of all 24 Undead Horde achievements worth 1,000 gamerscore. It takes around 10-12 hours to unlock all of the achievements on Xbox One.
Achievements they've won
Achievements they've not won
Start the second Era.
Find and complete all quests.
Find all secrets.
Claim all areas.
Claim all areas in the Citadel.
Scout all areas.
Acquire the legendary Necronomicon.
Unlock all the basic statues.
Gain 600000 gold.
Claim all areas in the Wastelands.
Use ring of plague to infect the living via chickens.
Kill three humans with a single scythe sweep.
Sell 20 skulls.
Claim all areas in Burning Rock.
Raise 1000 corpses.
Claim all areas in Alwyn.
Command a single unit to kill 20 enemies.
Claim all areas in the Catacombs.
Summon a hero from a hero statue.
Chickenify 20 enemies.
Raise a horde of 50 undead.
Reach level 5.
Slaughter 100 chickens.
Raise 15 corpses at once.