The secret when you get high enough refuels you.
How high do you need to be I was well over 2750 or whatever the omega helicopters height meter goes up to and never got refueled. I was trying to get that medal.
Also, I managed to get all five things destroyed, but to do it. I had to miss the first two and then hit the mountain and glacier and when I destroyed the wall I had to immediate flip over and fly all the way back the the snow mound and snowman. It was a lot of fun.