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.
Slay the mythical Beast of Carmague.
Conquer all levels in Winterlands.
Reclaim the Necropolis Throne.
Conquer all levels in Citadel.
Craft an item with three affixes.
Kill the Archmage.
Enter Citadel.
Conquer all levels in Desert.
Dig up 10 buried treasures.
Obtain 15 unique rune powers.
Reset your upgrade cards.
Upgrade a unit building to level 3.
Conquer all levels in Darklands.
Assign 5 nobles to council seats.
Unlock 10 different unit types.
Enter Desert.
Die for the first time.
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.
Include 5 different unit types in your horde.
Reach Level 6.
Solve the puzzle in Forgotten Crypt.
Restore 10 buildings in Necropolis.
Uncover 5 secrets.
Acquire your first talent.
Claim Scavengers' Bog.
Enter Darklands.