Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Altered Perception	Use Pulsars to collect all hidden Light Orbs in a level.
Enjoying Eris	Complete Eris.
Harmony amongst Discordia	Get S-Rank on every level on Eris.
The Stars Are Left	Travel 50000 AU to the left in Eris's Deep Space Mode.
Touch Fuzzy, Get Dizzy	Engage all Pulsars in a level.