Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Survive 2 minutes in the Necrodome.
Reclaim the Necropolis Throne.
Reset your upgrade cards.
Fully restore every building in Necropolis.
Conquer all levels in Citadel.
Kill the Archmage.
Include 5 different unit types in your horde.
Craft an item with three affixes.
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.
Enter Desert.
Unlock 10 different unit types.
Slay the mythical Beast of Carmague.
Gain 100,000 gold.
Complete all merchant's quests.
Find a noble soul jar.
Destroy a Freezing Monolith.
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.