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