No missable achievements (plus 56 unknown)
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Found a note that someone left behind
Died for the first time
Retrieved lost experience by collecting your ghost
Defeated First Warden
Bought your first Attribute or Spell Point
Defeated the Commander
Defeated the Worshiper
Met the Blacksmith
Collected all weapon types
Defeated the Infiltrator
Defeated the Champion
Unlocked all spells for one class
Defeated the Beast
Defeated the Guardian
Defeated the Annihilator
Defeated Lost Brothers
Defeated a boss with at least 20000 unspent experience
Killed all types of enemies
Completed the game as Warrior
Defeated a Boss without taking damage
Found 60 audio notes
Upgraded the Health Potions
Let the boss destroy the statue during fight
Completed all Infinite Voids
Completed all Proving Grounds
Completed the game as Rogue
Kicked an enemy into his death
Completed the game as Cleric
Looted all Treasure Chambers
Defeated the Keeper
Found all eight audio notes in the Ancient Labyrinth
Got 12 special weapons