Here is the full list of all 15 Zenith: The Last City achievements.
Cleanse the Khiren’s sacred crystals.
Search for the Khiren Amarites.
Avenge the farmers of Galian Valley.
Investigate the Exiled presence in the Fractured Plains.
Begin your Hero’s Journey as an Agent of Zenith.
Fight back the Rivu.
Investigate the cultist presence in the Obsidian Fortress.
Reassemble the Mind Keystone.
Face off against the pirates of the Radiant Coast.
Defeat the Pirate King and reclaim the Primal Wardkey.
Cleanse the Primal Wardkey in the Tangled Cove.
Shut down the foundries in the Ramshackle.
Discover the cultists' plot in the Emerald Desert.
Reassemble the pieces to the Creation Wardkey.
Empower the Creation Wardkey in the flying citadel.