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