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