@mattbfg
Here is the level and general path I took to get comeback kid.
http://www.youtube.com/watch?v=S6tGt3XN3zI
I ended up doing all the normal tricks on the same level. Here is the list.
http://www.xbox360achievements.org/forum/showthread.php?t=93276
"It may seem odd that you’re doing the same tricks twice with certain button combinations, but the game considers them different since the rider performs the trick on the opposite side of the bike..."