In the minigame SPLT-T2, on the Byte Seyes, you'll have to do 200 splits to get this achievement.
The goal of this game is to cut squares or rectangles in two. Each time there's 4 identical forms touching on a same point/corner, it'll become greyed out with a timer, and you'll not be able to do anything with it until the end of the timer, where it'll disappear, and another form will appear from the top.