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