Here is the full list of all 37 Salt and Sanctuary achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Aid a questing knight.
Aid a despondent thief.
Defeat the Unspeakable Deep.
Achieve the maximum devotion level in your creed.
Achieve the maximum upgrade level of a weapon.
Take an oath to the Order of the Betrayer.
Aid an unraveling sorceror.
Take an oath to the gods of Fire and Sky.
Bear all possible brands.
Take an oath to The House of Splendor.
Take an oath to The Iron Ones.
Defeat the Kraekan Cyclops.
Defeat the Queen of Smiles.
Take an oath to Devara's Light.
Discover your first brand.
Defeat the Mad Alchemist.
Take an oath to The Stone Roots.
Defeat the Sodden Knight.
Claim your first sanctuary.
Take an oath to The Three.