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