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