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