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