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