Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Craft an item with three affixes.
Survive 2 minutes in the Necrodome.
Fully restore every building in Necropolis.
Reclaim the Necropolis Throne.
Reset your upgrade cards.
Conquer all levels in Citadel.
Kill the Archmage.
Enter Citadel.
Conquer all levels in Desert.
Dig up 10 buried treasures.
Conquer all levels in Winterlands.
Obtain 15 unique rune powers.
Include 5 different unit types in your horde.
Conquer all levels in Darklands.
Assign 5 nobles to council seats.
Upgrade a unit building to level 3.
Enter Desert.
Unlock 10 different unit types.
Slay the mythical Beast of Carmague.
Die for the first time.
Gain 100,000 gold.
Complete all merchant's quests.
Find a noble soul jar.
Destroy a Freezing Monolith.
Enter Winterlands.
Stop the elven ritual and kill the ancient fire elemental.
Reach Level 6.
Solve the puzzle in Forgotten Crypt.
Uncover 5 secrets.
Restore 10 buildings in Necropolis.
Acquire your first talent.
Claim Scavengers' Bog.
Enter Darklands.