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