Here is the full list of all 45 Blasphemous achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Provoke the meeting between Redento and Cleofás.
Cross the Bridge door in less than 3 hours.
Unlock the ending B.
Beat all bosses without flask consumption.
Save all Kissers of Wounds.
Witness the last moments of Viridiana.
Help Cleofás in his path of redemption.
Get all prayers.
Get 100% of the game.
Unlock the ending A.
Beat His Holiness Escribar.
Discover all zones.
Beat Crisanta of the Anointed Blade.
Beat all types of enemies.
Get all collectibles.
Get all rosary beads.
Beat all the arena challenges.
Achieve the maximum value of health.
Buy all skills from the Mea Culpa shrines.
Talk with all the corpses.
Release all cherubs.
Get all sword hearts.
Bring all the offerings to Lvdovico.
Visit the tomb of The Lady of the Tailed Gown.
Use the Righteous Riposte 5 times.
Achieve the maximum level of the Mea Culpa sword.
Get all relics.
Bring all the offerings to the Blessed Lord of Salty Shores.
Achieve the maximum value of rosary bead slots.
Achieve the maximum value of flasks.
Hatch the Egg of Altasgracias.
Achieve the maximum value of fervor.
Beat Quirce, Returned by the Flames.
Beat Melquíades, The Exhumed Archbishop.
Help the Pilgrim reach his final destination.
Buy all the items of the Candelaria shops.
Beat Exposito, Scion of Abjuration.
Beat Esdras, of the Anointed Legion.
Execute 5 different enemies.
Beat the Our Lady of the Charred Visage.
Beat Ten Piedad.
Kill 666 enemies.
Beat the Tres Angustias.
Beat Perpetua.
Beat the Warden of the Silent Sorrow.