Originally Posted by Shinobi273
Do I need a spreadsheet or will the game show which ones I have completed?
it shows you how many you completed, but not the specific ones. i would definitely keep track of the story mission subquests, but the order mission ones are very easy to do. FYI you can do all of these with a partner. it makes the 10K damage one's a lot easier by having your partner clear the level while you sit back.
edit: in the earlier story missions (i think 00 - 04ish) what i said above holds true, but in the later missions the subquests you have not completed are blocked out. so you could beat the level and check what you have left, but only in the later missions