it's really not terribly difficult. Just try to land on your back wheel, and then as you do that lean forward and feather the gas. Try to stabilize on the bottom platform, then floor it to bump up to the second one, your front wheel will pop up so keep leaning forward. once you re stabilize on the second one, just floor it again and you should pop over the scoreboard. I have this track down to one fault so it usually works :P
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)