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