Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Reclaim the Necropolis Throne.
Fully restore every building in Necropolis.
Conquer all levels in Citadel.
Kill the Archmage.
Survive 2 minutes in the Necrodome.
Enter Citadel.
Conquer all levels in Winterlands.
Reset your upgrade cards.
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.
Conquer all levels in Darklands.
Assign 5 nobles to council seats.
Die for the first time.
Enter Desert.
Upgrade a unit building to level 3.
Unlock 10 different unit types.
Slay the mythical Beast of Carmague.
Complete all merchant's quests.
Gain 100,000 gold.
Destroy a Freezing Monolith.
Find a noble soul jar.
Enter Winterlands.
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.