Marathon Man: Classic Achievement
(01) Read The Re Release of The Halo Novels (The Fall of Reach & The Flood).
(02) Read The Halo Graphic Novel (Blood Line).
(03) Read (Halo: Evolutions - Essential Tales of the Halo Universe).
Marathon Man: Modern Achievement
(01) Play Through (Halo: Reach) Before Playing (Halo: Combat Evolved).
(02) Unlock all of The Terminals In Halo: Combat Evolved Anniversary & Halo Waypoint ALPHA HALO ARCHIVE.