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