Completed the whole game yet the lift off achievement does not work. Someone help me or fix the bug.

I got almost nowhere in this game. There is almost no fuel on Medium...you basically have to do the level nearly perfect. So I tried putting it on Easy. Still almost no fuel. It's not much fun if you can't progress even on Easy level. Easy should be, well, easy. I think this might be a case of the developer playing it so much during production and testing that it seems very easy to them (what I call "Developeritis") Anyone else finding this game frustratingly hard?...