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