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