The Byway or the Highway - 20g
Got the Red Star Ring located on the shortcut route in SPEED HIGHWAY Act 2 and reached the goal.
After you run down the building, you’ll be in a garage of sorts. Stick to the right side and you can break through a barrier. Follow this path until you cross over four flipping platforms, then stop. If you look up and ahead you should see two walls where you can use the wall jump technique. If you go up there and follow this path you’ll eventually get to the red ring after a rocket sequence.
Alternatively, you can take a different route if you fall through one of the platforms, or fail to locate the area in the garage. After running down the building, you’ll come to a highway with twists and turns. This is the highway where the left stick and right trigger pop up to show that you can drift. Keep following this highway and you’ll hit two bumpers. Follow along the moving / falling platforms and hit a third bumper. This will launch you to a short L shaped piece of road. You want to jump down and go to the left of this tiny area. Use the homing attack to get yourself in there.
To the left you will see a falling platform. Try to jump over it because it flips very quickly, but if you fall you can get back up so no worries. Above this flipping platform is two walls where you can use the wall jump technique. If you go up there and follow this path you’ll eventually get to the red ring.
Just finish the level and the achievement will pop.
Update - I've added a video below. The route taken is slightly different, but it works just the same. Credit to ALvl100Caterpie of Youtube for the video.