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