- last post: 01.01.0001 12:00 AM PDT
Hmph. The easiest way for me was to get a Windows Live ID and claim my gamertag. After I had a Windows Live ID, at the top of the Bungie page I just linked it to my Windows Live ID, which is, in turn, linked to My gamertag, etc. (Or at least the gamertag I use exclusively for Halo 2. Hence the 0 achievements.)
Only other thing I can think of is to sign into your gamertag/Windows Live ID and open a new tab of Bungie.net. I think I was already signed into Windows Live when I did it.