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