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.
Take an oath to the gods of Fire and Sky.
Aid a questing knight.
Aid an unraveling sorceror.
Achieve the maximum upgrade level of a weapon.
Achieve the maximum devotion level in your creed.
Take an oath to The Iron Ones.
Bear all possible brands.
Aid a despondent thief.
Defeat the Kraekan Cyclops.
Take an oath to The House of Splendor.
Discover your first brand.
Defeat the Mad Alchemist.
Take an oath to The Stone Roots.
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.
Defeat the Unspeakable Deep.