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