Here is the full list of all 33 Undead Horde 2: Necropolis achievements.
Fully restore every building in Necropolis.
Reclaim the Necropolis Throne.
Conquer all levels in Citadel.
Kill the Archmage.
Craft an item with three affixes.
Survive 2 minutes in the Necrodome.
Reset your upgrade cards.
Include 5 different unit types in your horde.
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.
Die for the first time.
Upgrade a unit building to level 3.
Unlock 10 different unit types.
Slay the mythical Beast of Carmague.
Enter Desert.
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.
Restore 10 buildings in Necropolis.
Uncover 5 secrets.
Acquire your first talent.
Claim Scavengers' Bog.
Enter Darklands.