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