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