Here is the full list of all 45 Blasphemous achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Get 100% of the game.
Unlock the ending B.
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.
Unlock the ending A.
Beat His Holiness Escribar.
Get all collectibles.
Beat Crisanta of the Anointed Blade.
Get all rosary beads.
Buy all the items of the Candelaria shops.
Buy all skills from the Mea Culpa shrines.
Get all prayers.
Release all cherubs.
Achieve the maximum value of rosary bead slots.
Achieve the maximum value of fervor.
Talk with all the corpses.
Achieve the maximum level of the Mea Culpa sword.
Beat all the arena challenges.
Get all sword hearts.
Help the Pilgrim reach his final destination.
Achieve the maximum value of health.
Bring all the offerings to the Blessed Lord of Salty Shores.
Get all relics.
Achieve the maximum value of flasks.
Bring all the offerings to Lvdovico.
Use the Righteous Riposte 5 times.
Beat Quirce, Returned by the Flames.
Beat all types of enemies.
Visit the tomb of The Lady of the Tailed Gown.
Help Cleofás in his path of redemption.
Beat Exposito, Scion of Abjuration.
Discover all zones.
Beat Melquíades, The Exhumed Archbishop.
Execute 5 different enemies.
Beat Esdras, of the Anointed Legion.
Hatch the Egg of Altasgracias.
Kill 666 enemies.
Witness the last moments of Viridiana.
Beat the Tres Angustias.
Beat Perpetua.
Beat Ten Piedad.
Beat the Our Lady of the Charred Visage.
Beat the Warden of the Silent Sorrow.