Superstar 50G
Attained all Stars on Insane Difficulty

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You must first unlock Insane Difficulty by completing the campaign once. While playing on this difficulty, you should be familiar with most of the campaign as well as the declassified missions. Accepting those missions always helps your score. There are 3 stars on each section of the game. If playing with partners on this difficulty (they must have completed the game once to play Insane with you), anyone who dies will make the last checkpoint reload. It might be helpful to review the below guide.

Insane Difficulty Walkthrough

3 STAR GLITCH ON INSANE WITH CO OP
Have one player on Insane difficulty and the other on casual. The casual does all of the work. At the end of the level, have the casual player quit out. Now finish the level. When the stat screen comes up with the starts, invite the player in. As long as you haven't hit continue, they will get credit as well as you for 3 stars on insane. This is the easy way out and I highly suggest it over doing it solo.

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