It's hard to imagine a Halo game without achievements, but in the long passed, black-and-white prohibition-era yesteryear of 2001, that's just how things were. No 'chievos to grind, no Gamerscore to bolster, and only the earliest, fledgling proto-trolls were hurling racial slurs over Xbox Live.
A lot has changed since then, and Halo: Combat Evolved Anniversary
knows that kids these days
couldn't handle a Halo experience devoid of achievements, so jump past the break for a complete list of points you never had the opportunity to earn in the first place.