Full list of all 20 Hexic (Windows) achievements worth 200 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Windows.
Finished 100 levels
Finished 66 levels
Finished 33 levels
Shared a 3 star score on any level higher than 80
Used all moves in a level without clearing any Dark Fragments
Finished a level by using an Assist on your last move
Finish an anomaly level without letting an anomaly out
Sent a move to a friend
Sent a life to a friend
Invited a friend to play Hexic
Finished the How-To-Play Tutorial
Shared something on Facebook
Made a cluster of Line Clear Hexes
Made 200 Color Clear Hexes
Created a Color Clear Hex from 5 hexes
Made a Flower Bomb
Earned three stars on 42 levels
Made 100 Line Clear Hexes
Use every Booster and Assist in the game
Use +3 Moves and finish a level in the last 3 moves