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