Here is the full list of all 45 Blasphemous achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Talk with all the corpses.
Use the Righteous Riposte 5 times.
Achieve the maximum value of fervor.
Get all rosary beads.
Release all cherubs.
Bring all the offerings to the Blessed Lord of Salty Shores.
Get all relics.
Achieve the maximum value of flasks.
Get all collectibles.
Achieve the maximum value of rosary bead slots.
Buy all skills from the Mea Culpa shrines.
Achieve the maximum level of the Mea Culpa sword.
Help Cleofás in his path of redemption.
Save all Kissers of Wounds.
Get all sword hearts.
Achieve the maximum value of health.
Beat Quirce, Returned by the Flames.
Beat all the arena challenges.
Beat all types of enemies.
Beat Melquíades, The Exhumed Archbishop.
Help the Pilgrim reach his final destination.
Visit the tomb of The Lady of the Tailed Gown.
Beat Exposito, Scion of Abjuration.
Buy all the items of the Candelaria shops.
Beat Esdras, of the Anointed Legion.
Bring all the offerings to Lvdovico.
Hatch the Egg of Altasgracias.
Beat the Tres Angustias.
Kill 666 enemies.
Beat Perpetua.
Beat the Our Lady of the Charred Visage.
Beat Ten Piedad.
Execute 5 different enemies.
Beat the Warden of the Silent Sorrow.
Beat Crisanta of the Anointed Blade.
Beat His Holiness Escribar.
Unlock the ending A.
Unlock the ending B.
Get all prayers.
Discover all zones.
Witness the last moments of Viridiana.
Provoke the meeting between Redento and Cleofás.
Beat all bosses without flask consumption.
Cross the Bridge door in less than 3 hours.
Get 100% of the game.