Just in case you're totally out of the Halo 3 loop, earlier this morning Bungie, unleashed the game's second title update and with it comes new playlists, a new ranking system and ten new achievements. You can learn more about the playlist changes, how the ranking system works, the changes on Bungie.net and view a general title update Q&A over at Bungie HQ.
But what about the 20 other "Mythic" achievements and their 500 Gamerscore that were discovered last night? Well, we still don't know exactly what they're all about, but team Bungie has acknowledged their existence. In their latest blog post, Bungie makes note that the other "Mythic" achievements are viewable but says that "we're not ready to comment on any other achievements right now" and that "all will become clear in due time."
So, exercise your patience skills for the time being and, while you wait, start unlocking Halo 3's additional 250 Gamerscore. We hear there's a special treat for those who go after the Vidmaster Challenge achievements.