CheatCodes.com has the complete list of all Tetris Splash Achievements and Gamerscores for X360, including all secret Achievements. All official X360 achievements for Tetris Splash as of Friday March 27, 2015 are shown below, or you can print out our Printable Achievements Checklist that shows all Tetris Splash Achievements and Gamerscores in a simple quick-reference format.
Clear five or more lines during one Single Player or Online Multiplayer game.
Reach or exceed level five in a Single Player game of Marathon.
Clear four lines at once.
Rotate the T-Tetrimino into a T-Slot to perform a one or two line clear.
Use at least one Mino from each of the seven Tetriminos to clear a single line.
Clear one or more lines with successive pieces to increase your Combo count above eight.
Win a "Free for All" match in Online Multiplayer.
Score a Back-to-Back Tetris in Online Multiplayer.
Accumulate at least ten hours of Online Multiplayer game play.
Perform a Single, Double, Triple, Tetris, T-Spin Single, T-Spin Double, and 8 Combo in one game!
Complete a Single Player game of Marathon in 20 minutes or less.
Complete a Single Player game of Marathon without using the Hold Queue.