Here is the full list of all 8 Mana Gloom achievements.
Participated in the beginnings of Mana Gloom's history.
Defeat the rock golem in the underground caverns.
Defeat the skeletal mage in the graveyard.
Defeat the Orcish Manamancer.
Reach level ten!
Charge your staff with pure starlight energy.
Vanquish the Mana Gloom
Defeat the Ratkin Necromancer