Living Legend
From Halopedia, the Halo wiki
Living Legend
Living Legend is an achievement in Halo: Combat Evolved Anniversary. It is awarded for completing the campaign on Legendary. It is worth 50 Gamerpoints. [1] Receiving this achievement most likely also rewards the player the "Birth of a Spartan" and "Believe in a Hero" achievements if he or she hasn't completed the campaign on Normal and Heroic, respectively.
It is represented by the Legendary difficulty shield, which also represents the Halo: Reach achievement "Gods Must Be Strong".