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