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