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.
Beat Perpetua.
Get 100% of the game.
Get all prayers.
Release all cherubs.
Get all collectibles.
Talk with all the corpses.
Get all rosary beads.
Unlock the ending A.
Beat His Holiness Escribar.
Beat all types of enemies.
Use the Righteous Riposte 5 times.
Beat all the arena challenges.
Get all sword hearts.
Discover all zones.
Beat Crisanta of the Anointed Blade.
Achieve the maximum value of health.
Achieve the maximum value of flasks.
Buy all skills from the Mea Culpa shrines.
Achieve the maximum value of rosary bead slots.
Achieve the maximum value of fervor.
Bring all the offerings to Lvdovico.
Bring all the offerings to the Blessed Lord of Salty Shores.
Get all relics.
Achieve the maximum level of the Mea Culpa sword.
Hatch the Egg of Altasgracias.
Help Cleofás in his path of redemption.
Beat Quirce, Returned by the Flames.
Beat Melquíades, The Exhumed Archbishop.
Help the Pilgrim reach his final destination.
Visit the tomb of The Lady of the Tailed Gown.
Witness the last moments of Viridiana.
Beat Exposito, Scion of Abjuration.
Execute 5 different enemies.
Buy all the items of the Candelaria shops.
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 the Warden of the Silent Sorrow.