343 Industries has, via the latest bulletin on Waypoint, released a full list of Achievements for Halo 4, but be warned, there are spoilers galore.
Even if spoilers aren't your thing, it's still worth visiting the page, as there's links to samples of music set to feature in the game's Original Soundtrack and Special Edition Remix Album, as well as details of the luxurious Halo 4 Special Edition 2-Disc Box Set (due out on October 22 - and available for pre-order here).
The box set, a real collector's piece, contains the following treats:
Halo 4 Original Soundtrack, Halo 4 14-track remix album, Exclusive "Making of Halo 4 Music" DVD containing over 70 minutes of unique behind-the-scenes footage, interviews, and recording sessions from Abbey Road, Exclusive hardcover book on the "Making of Halo 4 Music" featuring production and composition notes from Neil Davidge plus exclusive behind-the-scenes photos and exclusive artwork images, Exclusive 12" Neil Davidge signed art print, Exclusive 180g heavy weight 12" Vinyl Full color Picture Disk of Master Chief and Cortana in a uniquely designed Sleeve bag, Exclusive Avatar T-Shirt download (Male & Female). The first 5000 orders will all be individually numbered in a limited series and personalized by Neil Davidge.
For more details on the soundtrack, and the various ways in which it can be purchased (or to just have a listen), head over to Halo: Waypoint.