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