Challenge Mode Blues
 

I think I have hit my limit in this god forsaken mode at 43% done and 86 missions complete. Has anyone else felt the overwhelming desire to break the disc in half because of this achievement?

it took me along time and its a pain in the ass, my only suggestion is do what you can do with 1 set of challenges, then change the game in Options from 1.03 to 1.02 or vise-versa this will give u an alternate set of challenges. Alot of the challenges 3~4 are easier in 1.03 then they were in 1.02 but either way its an alternate set, and finishing a challenge in either version will carry over in both version.

Oh sweet merciful god somehow I got the rest of them! now I never have to look at that damn achievement ever again.