You need to earn 3 stars on all 48 Challenge levels. You can earn up to 3 stars per level, with each star being awarded when you surpass 15, 30, and 45 points, respectively. You get 4 disks to earn as many points as possible. Each coin collected is worth 2 points and each disk can score points if it finishes the challenge in a scoring zone (5, 10, or 15 point zones).
Initially, take a few tries to become familiar with the level. Decide how best to take your shots to reach the 45 point mark. Most times you should focus on collecting coins on the way to the scoring zones. However, sometimes it is better just to straight-up go for the scoring zones. Earning one star will "complete" the challenge level and unlock the next one. However, earning 3 stars is required so you might as well get them all before moving on to the next level.
NOTE: The Windows 8 version of the game has 12 more Challenge levels than the Windows Phone version, all of which need to be completed for this achievement.