In the start menu choose the second option (Xbox Live), now the third option (create a lobby), in the top left the third option (exam) now press a to start the game mode. For this achievement you have to complete the 18th stage (to unlock this you have complete all the others before 1-17).
In this mode you must clear 2 Tasks:
1. 5 Laserlines in 1.50 minutes
2. 80 Lines (Hypermode) in 3 Minutes