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click the period in the goal checklist of the "achieving the impossible" badge and watch the superb video of "Kiwi!" by maydeti.
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to get the hard badge try to reach the archievements and if you see that you fail to have the archievements you aim just reload the page of the game before your fly ended and you will start again at the beggining of the day, it will avoid you to start 100 time the all game.
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upgrade everything. go on the 50 ramp. make your angle 3%. rocket to 175 mph. when you reach 150 mph rocket to 175 again. you'll get the meduim badge then. hope it helps, try and keep this comment alive.
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For the Hard badge, try to get as many achievements and as much money on every run, in order to afford spec points and better gliders and rockets. Always prioritise getting the better glider. And on day 18, follow the advice of lettas in the top comments. Oh, yeah, there's a lot of luck involved too.