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