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