Here is the full list of all 53 The Last Faith achievements.
Defeat Medeya.
Be consumed by the Cosmic Voice.
Reach the true ending.
Upgrade any primary weapon to its maximum level.
Deliver all of the blueprints to Mariano.
Defeat Caterina and Annabella.
Defeat Lord Laddak.
Acquire all firearms.
Acquire all Healing Holsters.
Defeat Leena.
Defeat the Cold One Beast.
Acquire all Federal Era Belts.
Finish Madelyne and Theodora's quest.
Defeat the Burnt Apostate.
Use the Stigma of Transcendence.
Acquire both of Esk’s eyes.
Defeat the Harbinger of Nightmare.
Defeat the Starlight Beast of Illygarth.
Raise any stat to level 50.
Acquire the Celestial Larva.
Defeat Manfredd the Accursed.
Defeat Lisa.
Perform 30 execution moves.
Defeat the second Starborn Nighthunter.
Acquire the Propulsion Boots.
Defeat Yegor and Leena.
Finish Helenya’s quest.
Finish Lady Annika’s quest.
Defeat the first Starborn Nighthunter.
Finish Lucyl’s quest.
Defeat the Voracious Terror.
Spend over 50,000 Nycrux.
Acquire the Nighthunter’s Grappling Claw.
Defeat Edwyn the Shadowscourge Horror.
Acquire the Gravitational Ring.
Acquire the Technological Lens.
Defeat Dr. R. Hermann.
Defeat the Winged Pale Laments.
Kill 100 enemies.
Defeat the Giant Patron.
Defeat the Old Wymond.
Defeat Nyxaroth the Eldritch Wight.
Acquire every Sepolcro.
Finish Aldrich's quest.
Deliver all the dried livers to Lady Dorothea.
Deliver all the Unborn of the Midnight Aristocracy to the Woman in Ink.
Acquire all primary weapons.
Acquire all spells.
Upgrade any secondary weapon to its maximum level.
Find all notes.
Parry 50 incoming attacks.
Accept the Throne.
Unlocked all achievements for The Last Faith.