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