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