Bungie Weekly Update revealed the studio's fairly brilliant strategy for foiling the attempts of haxx0rs who planned on leaking the Achievements for Halo: Reach. All the team has to do, you see, is leak the Achievements first. Not the full, detailed list, mind you -- just the icons, which are posted in the image seen above.
The game's 49 unlockable honors are broken down into five groups, Campaign (23), Firefight (7), Multiplayer (4), Training (6) and Player Experience (9). You can find the descriptions of six of the Achievements posted after the jump. For all the rest, you're just going to have to use your imagination. For instance, that one with the Caduceus on it? We're pretty sure that's the Achievement for when you put down your guns, go back to school, and become a Registered Nurse.