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