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