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