Here is the full list of all 13 Legends of the Universe - there are Cosmic Bounty achievements.
Complete Aya's Section
Unlocked Beam
Unlocked Bombs
Completed Space Segment
Unlocked Double Jump
Unlocked Glide
Defeated Omegakron
Unlocked Rapid Shot
Unlocked Rockets
Unlocked Run
Found the StarCore
Defeated Volgat
Obtained 999 Zil