Achievements. You want them. You can pretend like you don't, but we all have a little Achievement whore in us.
Halo: Reach. You want it. You can pretend like you don't, but we all have a little Halo whore in us.
Put your want for Achievements and your want for Halo together and you'll find a post you should be quite interested in. Bungie has released the full list of Achievements for Halo: Reach and there are 49 of them. They break down like this: Campaign (23), FireFight (7), Multiplayer (4), Training (6), and Player Experience (9).
Bungie only revealed details for five of the Achievements:
Who's ready to start earning things?