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