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