Full list of all 15 Orbital achievements worth 200 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Windows Phone.
Finished 10 local Multiplayer games
Placed thirty Orbs on the playing field
Destroyed 15 Orbs in one Pure game
Received "That was close" three times in one game
Destroyed 50 Orbs in one Gravity game
Earned 200 points in one Supernova game
Accomplished ten Triple Hits in one game
Played a Multiplayer game with a friend
Finished 100 games
Accomplished ten Double Hits in one game
Finished 25 games
Received "That was close" in one game
Placed ten Orbs on the playing field
Destroyed 5 Orbs in one game
Destroyed your first Orb