It's not hard to find, but if you want, sure, I can make a GUIDE, for finding TWO missions that are VERY CLOSE to each other, sure
yes, but doing that technically wouldn't count as a mission completion, which means you wouldn't get proper 100%, and what I was trying to say is, All Missions would probably allow that since it doesn't require to finish the level 100%, this is just a big assumption tho. (do add All Missions as a category tho) :)
probably not, since you need to complete all the missions, if there was a category called "All Missions" or "All Story Missions" then yes, you could potentially do that, but I don't think it would count as 100%, let me know if I'm wrong :)
So Story Mode has 2 categories: Story Mode (Stan. & Spec.) and Story Mode 100%, I honestly think that All Missions should be a category aswell, since 100% is, thank you.