Ok, so to much frustration, confusion and debate on here with this achievment like "is it bugged?, is it patched?, can you only use USB stick solution now?" ect ect. I took the time to (painfully) obtain this cheev tonight myself and explain in this solution what criteria i needed to meet to make this one pop.
People say this cheev is glitched. but its NOT. People are just reading the achiement description wrong i think. notice how it says "in STORY mode".
Please read carefully :)
If you have ALREADY completed the single player story campaign, this is the "story" over. It WILL NOT pop if you go back and re-do missons from the single player misson menu because these now become just single "missons". It is not the "STORY". (trust me. ive tried), so tough luck if you didnt get it on your first playthrough (although it makes no difference either way lol)
(( Note:: if you havent completed the story, then u can still get it. but depending on how far on you are with it, u may just want to do as i have written below. its probably the easiest way really)
This cheev will now have to be done online in "Co-op Story" (coop story is under "player match" and press RB to filter along to coop story)
Quick note: DO NOT play "Co-op Mission" as this will not count.
Set up your own match on the level "training day" (or one you prefer but i recommend that one) and make sure the settings are to your requirements, i.e set it to 2 players max, and an invitation only game, because you dont want some random joining and ruining 59mins work!!!! (or get a friend that needs it too, because this cheev is pretty boring!).
Now just fly around with assistance off for 60 mins. fly up high and get a rubber band for the controller stick and ram it in one direction. stay near the tv and keep an eye on your height. it doesnt matter if you crash or go out the map though, you just restart from last checkpoint. (as this is a cumulative achieve, it adds up all the time)
So its not bugged, and you dont need a USB stick after all.
You just need a spare 60mins!
Hope this helps clear things up abit!
if your are confused please comment and i will try and help!
**also please see my solution on the "Peripheral Vison" cheev if your struggling on that because i know it can help you out :)