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