For The Devil’s in the Details achievement, you don’t have to beat Satan in back to back perfect rounds. If you perfect the first time, but he hits you in the second, you can still perfect him in the third round to get the badge.
In order to complete "5 zilch-free wins in a row" and "10 consecutive win against CPU" awards you can restart games that you are sure you are going to lose.
Don't upgrade your car. Achievements like Clean Race (Don't hit any road objects), Stay on Road, Zero Air Time and Full Speed (Don't release the accelerator) get even harder when you upgrade your car.
This game is one of the best examples on how a flash game should be. 1 - A lot of fun 2 - nice art 3 - achievements (of course) both in game and kongregate's 4 - Don't need to spend 100 hours to finish (that time I would save for XBOX)
@skroog - lvl 20 in hanna in a choppa - use the string to pull the building... you can attached it to any of those balls in the building. Same can be done on lvl 15. You have to use the string in order to get the perfect medal.
After 8th level just stop feeding the baby birds. Just kill the people using car explosions. Randomly they will fall into the nest feeding your babies :D You just need to reach level 10.