Under rating threshold (hideshow)
All 8 hidden achievements:
1.Give an inch - Click on your money in the shop to earn a dollar
[1]He'll take a yard- Click on your money in the shop again
2.The Brick - In the Gliders catalog, in the shop on the last page, then click under the whirlybird 512 to get the brick.
3.Revenge of the Brick - On story mode destroy an obstacle using the Brick
4.Its Rob! - You have to buy the booster in the bonus shop, then next time you fly you will get resupplied with fuel and get the medal
5.Rise! - Buy the phoenix feather in the bonus shop and next time you fly when you land you will get shot back up in the air and get the medal.
6. The Easy Way - (Learn the secret by completing story mode) click on the birds beak at the main menu
7. Achievement! - click on the medal
8. I.C.B.P - fly over "the wall" in story mode this also takes to a cut-scene