This achievement is unlocked by collecting the hidden star within the corresponding level. Stars will only appear once you're within their proximity.
This star can be found in the area "Mindful State 4/Practice", in the level "Orbit" (8th level on the page, or the middle of the bottom row).
Once in the level, the star be found in the lower left quadrant of the circle, as shown in the screenshot below. Once collected, you must also complete the level in order to pop the achievement.