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