I have this same issue. I have four saves and only two of them are playable now, the one on my hard drive and the one on my memory stick. The rest read as completed when I try to access them. They all seem to go off the save I've completed.
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Originally Posted by AshTheZombie
I have also had problems with the achievements
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Try to recover your profile on your Xbox (delete the profile and then download it again). When you recover it, you should be able to play through the episode again and unlock the achievements, getting the points that you didn't get before.
Edit: I rewound a bit (to Chapter 6: Ben Screws Up) on the only save that it was letting me access and finished the game again. All the saves are working correctly now. Maybe you only have to redo the last chapter (Chapter 7: Penultimate) to fix it, I dunno.