Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Survive 2 minutes in the Necrodome.
Fully restore every building in Necropolis.
Reclaim the Necropolis Throne.
Conquer all levels in Citadel.
Kill the Archmage.
Craft an item with three affixes.
Reset your upgrade cards.
Enter Citadel.
Conquer all levels in Desert.
Dig up 10 buried treasures.
Conquer all levels in Winterlands.
Obtain 15 unique rune powers.
Conquer all levels in Darklands.
Assign 5 nobles to council seats.
Upgrade a unit building to level 3.
Die for the first time.
Enter Desert.
Unlock 10 different unit types.
Slay the mythical Beast of Carmague.
Complete all merchant's quests.
Gain 100,000 gold.
Destroy a Freezing Monolith.
Include 5 different unit types in your horde.
Find a noble soul jar.
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.