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.
Talk with all the corpses.
Save all Kissers of Wounds.
Get 100% of the game.
Provoke the meeting between Redento and Cleofás.
Cross the Bridge door in less than 3 hours.
Witness the last moments of Viridiana.
Get all rosary beads.
Get all prayers.
Use the Righteous Riposte 5 times.
Bring all the offerings to Lvdovico.
Achieve the maximum value of flasks.
Get all collectibles.
Release all cherubs.
Achieve the maximum value of rosary bead slots.
Help the Pilgrim reach his final destination.
Achieve the maximum value of fervor.
Buy all skills from the Mea Culpa shrines.
Unlock the ending A.
Beat His Holiness Escribar.
Beat Crisanta of the Anointed Blade.
Help Cleofás in his path of redemption.
Bring all the offerings to the Blessed Lord of Salty Shores.
Get all relics.
Achieve the maximum level of the Mea Culpa sword.
Achieve the maximum value of health.
Beat all the arena challenges.
Beat Quirce, Returned by the Flames.
Beat all types of enemies.
Get all sword hearts.
Beat Exposito, Scion of Abjuration.
Buy all the items of the Candelaria shops.
Beat Melquíades, The Exhumed Archbishop.
Discover all zones.
Beat Esdras, of the Anointed Legion.
Execute 5 different enemies.
Visit the tomb of The Lady of the Tailed Gown.
Hatch the Egg of Altasgracias.
Beat the Tres Angustias.
Beat the Our Lady of the Charred Visage.
Kill 666 enemies.
Beat Perpetua.
Beat Ten Piedad.
Beat the Warden of the Silent Sorrow.