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