OK, I have the official descriptions for the Halo 3 Vidmasters. Vidmaster Challenge: Classic Finish any level solo on Legendary, on Live, with no shots or Grenades thrown. In other words you'll have to beat your way out. At least you don't have to have skulls on! Vidmaster Challenge: Endure In Firefight, or any mission, pass the 4th set on 4-player co-op on Heroic. 4 Sets>12 Rounds>60 Waves! At least it's on Heroic! Vidmaster Challenge: Deja Vu Complete Highway on 4-player Legendary Live co-op, with Iron, and no 'Hog or Scorpion. Deja Vu is right. At least they didn't say anything about Choppers... if there are any. Anyways, here they are. I still don't have the Annual achievement yet, but I think the only one here that would be trouble is Endure.
I also think endure is the hardest because you have to fight 60 waves to get to the 4th set I believe. Second hardest is Deja Vu and easiest is Classic. But all the achievements have been known for a month or longer.
This should be in the Halo 3: ODST Discussion sub-forum. Mods, please move this thread to the appropriate section. Wow these are gonna be hard. Hope I achieve them.
sorry mate but these were leaked a while back, although I havent noticed them untill now so thanks for bringing them here