Speed Limit (JP)

After trying countless times I came to the conclusion that this achievement only unlocks on Normal difficulty, it never worked for me on Easy. At the end of level 6, you need to miss the helicopter that will let you transition to Stage 7, to do that you must miss all the 5 ramps or at least the final ones so you don't get inside the choppa as the description suggests. When I got the achievement I used the first 3 ramps and shot the helicopter and then missed the last 2, but I know other people just missed all 5 ramps and still got the achievement.

Video of me getting the achievement: