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If you are curious about the Halo: Reach achievements then here you go. The full list of all 49 Achievements that can be earned in the game in the various modes.
Aiming to stay ahead of internet leaks, Bungie previously teased and leaked a few of the achievements for Halo: Reach for the Xbox 360. They aren't teasing anymore as they've released the complete list of achievements along with their icons.