True Star Achievement
Collect at least 100 Red Stars from Gold Rush Mountain
In the Carousel Junction alley you will find a game called Gold Rush Mountain. The object of this mini game is to stretch out your arms to hit gold coins as you travel up and down the coaster. Hitting the red stars will deduct from your overall coin count however for the purposes of this achievement you have to catch 100 red stars.
The achievement will pop when you hit the 100th star, not at the end of the run so you might still be able to get some coinage to your total!