If you guys want, I can record my replays of the tracks, and explain how I did them. Both of the other tracks I have gold, but with faults. This will allow me to accurately have you see what I do and have my explanation match the video exactly. However I only have a SD camera, so I'd have to record the video while it's playing on my tv. however my TV is HD so maybe it will still look ok.
Winding down the achievement hunting...
95%+ Completion (142/164 games complete w/ DLC (Most Recent: Trials Fusion for the 360)
Halo Fanatic: All Gamerscore (Including DLC) in Halo CEA, 2, 3, 4, ODST, Reach, and Spartan Assault (360, X1, and W8)