Here is the full list of all 10 Kinect Sports Gems: 3 Point Contest achievements worth 50 gamerscore.
Reach level 10 (or observe another player doing so) to gain the rank of Slam Dunk Superstar.
Reach level 9 (or observe another player doing so) to gain the rank of 3 Point Master.
Reach level 8 (or observe another player doing so) to gain the rank of Pro Player.
Mighty! You reached level 7 (or observed another player doing so) to transform into Bank Shot Hero.
Like a blur! You reached level 6 (or observed another player doing so) for promotion to Fast Mover.
High times! You reached level 5 (or observed another player doing so) to rank as Tear Drop Baller.
Shiny! You reached level 4 (or observed another player doing so) and the title of High School Star.
Love it! You reached level 3 (or observed another player doing so) to get to Basketball Enthusiast.
On the up! You reached level 2 (or observed another player doing so) to become a Jump Shot Wannabe.
Sweet! You reached level 1 (or observed another player doing so) and you're now a Preschool Player.