Full list of all 56 Lords Of The Fallen achievements. It takes around 60-80 hours to unlock all of the achievements in the base game on Windows.
The base game contains 46 achievements, and there is 1 DLC pack containing 10 achievements.
Led Rhogar to victory
Completed the game as Rogue
Entered 15 secret rooms
Collected 20 armor sets
Got 12 special weapons
Completed the game as Cleric
Led humans to victory
Found 60 audio notes
Unlocked all spells for one class
Killed the First Warden with the Warden Greatsword
Completed the game as Warrior
Bring balance to both realms
Completed all Proving Grounds
Defeated Lost Brothers
Defeated a boss with at least 20000 unspent experience
Killed all types of enemies
Met Adyr
Looted all Treasure Chambers
Defeated the Annihilator
Showed mercy to an imprisoned monster
Collected 9 Tyrant Hearts
Completed all Infinite Voids
Defeated the Guardian
Purified the sword of the unlucky grave robber
Upgraded the Health Potions
Defeated the Beast
Met Antanas
Collected 25 Human Skulls
Throw a corpse down the bottomless pit in Catacombs
Defeated the Champion
Defeated the Infiltrator
Collected all weapon types
Met the Blacksmith
Entered the Rhogar realm
Defeated the Worshiper
Defeated the Commander
Let the boss destroy the statue during fight
Kicked an enemy into his death
Defeated a Boss without taking damage
Found the Gauntlet
Cut off Monk's arm
Bought your first Attribute or Spell Point
Defeated First Warden
Retrieved lost experience by collecting your ghost
Died for the first time
Found a note that someone left behind
Defeated the Judge with a weapon dropped by the Keeper
Chose a perfectly fitting armor
Just in case you picked up a shielding map
Plundered all four resting places
Defeated the Keeper
Defeated the Keeper after changing his initial magic school to the fire type
Manipulated the Keeper's magic schools
Killed 40 ghosts in the Ancient Labyrinth
Found all eight audio notes in the Ancient Labyrinth
Met a strange person in a strange place