Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Reset your upgrade cards.
Survive 2 minutes in the Necrodome.
Craft an item with three affixes.
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 Winterlands.
Obtain 15 unique rune powers.
Conquer all levels in Darklands.
Upgrade a unit building to level 3.
Assign 5 nobles to council seats.
Slay the mythical Beast of Carmague.
Enter Desert.
Unlock 10 different unit types.
Include 5 different unit types in your horde.
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.
Die for the first time.
Solve the puzzle in Forgotten Crypt.
Uncover 5 secrets.
Restore 10 buildings in Necropolis.
Acquire your first talent.
Claim Scavengers' Bog.
Enter Darklands.