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