actually my brother found this but anyway I might as well tell u guys. It just buys everything w/o u wasting any money in the store
Heres how u do it:
1st do the unlock everything code
then go to career (any difficulty will do)
finally go into the store
Then your acheivment thing will pop up a few times if not then i dont know...
you'll only get like 15 to 20 gamerscore points for doing this glitch.