Greased Lightning - 10G (Original Achievement)
To get this Achievement, you must clear Green Hill Act 1 within 1 Minute.
This will be very close and usually you will barely get this at around 53+ seconds. However this will become very easy with enough practice.
Below is a video of mine, showing the path I suggest you take (spin dash when I do, and jump when I do.) as well as show you how to get 3 other Achievements.
The Ring King achievement in Sonic Generations worth 24 pointsReach the goal without dropping any of the rings you collected in GREEN HILL Act 1.