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