Here is the full list of all 45 Blasphemous achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Unlock the ending B.
Witness the last moments of Viridiana.
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.
Use the Righteous Riposte 5 times.
Unlock the ending A.
Get 100% of the game.
Beat His Holiness Escribar.
Talk with all the corpses.
Get all sword hearts.
Get all prayers.
Help Cleofás in his path of redemption.
Get all rosary beads.
Release all cherubs.
Get all collectibles.
Visit the tomb of The Lady of the Tailed Gown.
Achieve the maximum value of fervor.
Achieve the maximum value of flasks.
Buy all skills from the Mea Culpa shrines.
Achieve the maximum level of the Mea Culpa sword.
Achieve the maximum value of rosary bead slots.
Bring all the offerings to Lvdovico.
Achieve the maximum value of health.
Get all relics.
Bring all the offerings to the Blessed Lord of Salty Shores.
Hatch the Egg of Altasgracias.
Discover all zones.
Beat Crisanta of the Anointed Blade.
Beat all types of enemies.
Beat all the arena challenges.
Beat Melquíades, The Exhumed Archbishop.
Buy all the items of the Candelaria shops.
Beat Quirce, Returned by the Flames.
Help the Pilgrim reach his final destination.
Execute 5 different enemies.
Beat Exposito, Scion of Abjuration.
Beat Esdras, of the Anointed Legion.
Kill 666 enemies.
Beat the Tres Angustias.
Beat Perpetua.
Beat Ten Piedad.
Beat the Our Lady of the Charred Visage.
Beat the Warden of the Silent Sorrow.