not as far as i know. you have to complete them to unlock the rest. if you are on PS3 i hear there is a file floating around that could help you. if you are on xbox...you are going to have to keep plugging away. i remember mine stalled out on something and i just flew around and did maneuvers and if gave me a mission complete! try rebooting from the very beginning...other than that dont know what to tell you.
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