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I seem to recall I was missing some of those as well, but there were 2 (or 3?) special missions I never did get around to finishing, and I assumed that's what would have unlocked the rest of them. Guess not, since you said you did all of them. Unfortunately I don't have access to a PS2 at this time and my PS3 isn't backwards compatible, so I'm afraid I can't check my game and help you out. Sorry. =/