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