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.
Enter Citadel.
Conquer all levels in Desert.
Dig up 10 buried treasures.
Conquer all levels in Darklands.
Conquer all levels in Winterlands.
Obtain 15 unique rune powers.
Reset your upgrade cards.
Craft an item with three affixes.
Assign 5 nobles to council seats.
Include 5 different unit types in your horde.
Enter Desert.
Slay the mythical Beast of Carmague.
Upgrade a unit building to level 3.
Unlock 10 different unit types.
Gain 100,000 gold.
Complete all merchant's quests.
Destroy a Freezing Monolith.
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.
Restore 10 buildings in Necropolis.
Uncover 5 secrets.
Die for the first time.
Acquire your first talent.
Claim Scavengers' Bog.
Enter Darklands.