Posted on 30 November 12 at 15:48
I had this problem, but i found a solution, kinda. My friend has my account on his xbox, and he wanted to play the game as metal sonic under my name. I didnt get the mission achievements so I said "screw it" and i got all the emblems. I put my save game on cloud, he signed in as me, and he got the achievements for me instantly. He had the 1.49GB version of the game, which is the good one, while I had the 1.6GB version, the broken one. So if you have a friend with the good version and can trust him to have your account info, you can get them. This did NOT work for level A as metal sonic though. Hopefully this can resolve the issue a bit.