The Sun and Moon (EP)

System Seven consists of levels 101 - 110 plus boss level VII. Remember that there is no time limit for completing levels for this achievement, so take your time so you don't die needlessly over and over.

System Seven combines a couple of items from earlier systems, such as disappearing platforms from system two, phasing through structures like system four, but with the addition of some precision movements required to move up or down pillars at precise locations. The boss battle consists of a boss that not only chases you but leaves spikes in his wake, so you'll have to plan out your route so that you don't go back to the same area more than once. 

Upon completing all 10 levels and boss level VII, the achievement will unlock.