You have to clear the EX stage of the fourth Tetris Road (Star Road) for this achievement.
To get to this, on the main menu:
2nd option (Xbox Live)
3rd option (Create a Session)
Top left option, set it to the 2nd option from the top, which is tetris road.
Then select the top most option. This will search, come to a miniature lobby, and then load the game with a 15 second countdown.
Select the 4th option from the drop-down menu.
You have 10 stages in this road:
1) Tetris - Get 5 tetrises in 2 minutes
2) Eraser - Erase 4 lines in 2 minutes
3) Target - Remove 3 rounds of target squares in 90 seconds.
4) Cycle - Get a Single, Double, Triple, & a Tetris in any order, in 90 seconds
5) Level Star - Get 40 lines in 2 minutes 10 seconds
6) Big - Get 20 lines in 90 seconds
7) Target - Remove 3 rounds of target squares in 2 minutes 10 seconds
8) Eraser - Remove 6 lines in 2 minutes
9) Cycle - Get a Single, Double, Triple, & a Tetris in any order, in 90 seconds
10) High Speed 2 - Get 10 lines in 40 seconds. Try and finish this stage with a double-line clear, as this will allow you to play the EX stage...
MAKE SURE YOU COMPLETE EITHER THE 5TH OR 10TH STAGE WITH A DOUBLE-LINE CLEAR
If you do not, you will not be able to get this achievement on this playthrough of this Tetris Road.
If you finish stage 5 (Level Star) or stage 10 (High Speed 2) with a double-line clear, you'll get the EX stage...
EX) High Speed 2 - Get 35 lines in 2 minutes.
If you manage to complete the EX stage, you will unlock this achievement.