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.
Save all Kissers of Wounds.
Provoke the meeting between Redento and Cleofás.
Cross the Bridge door in less than 3 hours.
Beat Esdras, of the Anointed Legion.
Get 100% of the game.
Unlock the ending A.
Get all rosary beads.
Beat all the arena challenges.
Use the Righteous Riposte 5 times.
Buy all skills from the Mea Culpa shrines.
Unlock the ending B.
Beat His Holiness Escribar.
Discover all zones.
Beat Crisanta of the Anointed Blade.
Talk with all the corpses.
Achieve the maximum value of flasks.
Get all sword hearts.
Get all collectibles.
Get all prayers.
Release all cherubs.
Achieve the maximum value of fervor.
Achieve the maximum value of rosary bead slots.
Help Cleofás in his path of redemption.
Achieve the maximum value of health.
Achieve the maximum level of the Mea Culpa sword.
Beat Quirce, Returned by the Flames.
Beat all types of enemies.
Bring all the offerings to the Blessed Lord of Salty Shores.
Get all relics.
Bring all the offerings to Lvdovico.
Hatch the Egg of Altasgracias.
Help the Pilgrim reach his final destination.
Beat Melquíades, The Exhumed Archbishop.
Buy all the items of the Candelaria shops.
Witness the last moments of Viridiana.
Beat Exposito, Scion of Abjuration.
Kill 666 enemies.
Beat Ten Piedad.
Execute 5 different enemies.
Visit the tomb of The Lady of the Tailed Gown.
Beat the Our Lady of the Charred Visage.
Beat the Tres Angustias.
Beat Perpetua.
Beat the Warden of the Silent Sorrow.