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