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.
Take an oath to the Order of the Betrayer.
Aid a despondent thief.
Take an oath to The Stone Roots.
Take an oath to the gods of Fire and Sky.
Aid an unraveling sorceror.
Aid a questing knight.
Take an oath to The House of Splendor.
Defeat the Unspeakable Deep.
Take an oath to Devara's Light.
Achieve the maximum devotion level in your creed.
Achieve the maximum upgrade level of a weapon.
Bear all possible brands.
Take an oath to The Iron Ones.
Discover your first brand.
Defeat the Kraekan Cyclops.
Defeat the Queen of Smiles.
Defeat the Mad Alchemist.
Defeat the Sodden Knight.
Claim your first sanctuary.
Take an oath to The Three.