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