Bright Star - 15G (Original Achievement)
To get this Achievement, you must get an S Rank on any level in the game.
To get an S Rank, you MUST NOT DIE. That is the main key to this as well as getting to the goal as fast as possible.
I recommend two ways to do this.
1. Go through the levels and get a feel for them. once you know what you're up against, or once you've found enough shortcuts to feel confident, go for it.
2. Believe it or not, I actually got most of my S Ranks while going for my Red Star Rings. I watched SadFaceGaming on Youtube and ran to where they were, getting each Red Star Ring, and pausing the game when I watched to see the next RSR's location. Doing this will force you to move faster than you think your going, and take shortcuts you probably didnt know about, making your S Rank easy. (Just remember to pause between RSR's!)
Below is a video of mine showing how to get 3 other Achievements besides this one.
The Ring King achievement in Sonic Generations worth 25 pointsReach the goal without dropping any of the rings you collected in GREEN HILL Act 1.
I show how to get this Achievement in Green Hill Act 1, which is guaranteed if you get the "Greased Lightning" Achievement.