Abbasid Might

Needs Legacy of Persia - the Dominance ending of the Iranian Intermezzo (shown in-game as Renewed Caliphate), as the 867 Abbasid Caliph. Beat the starting rebellion, conquer the Arabian peninsula, press your claim on the Tulunids, then deal with the non-Sunni eastern rulers: conquer them, or fabricate weak hooks on anyone with the Detractor of the Caliphate trait to force them to Supporter. Pilgrimage for devotion while you wait for the Stabilization phase, then take the ending. One ending per campaign - Iranian Revival, Shia Reborn and All Your Caliphate Are Belong To Us each need their own run. (This achievement was renamed on Steam from "The Abbasid Restoration"; if you see both here, they're the same thing.)