Here is the full list of all 27 Spectra achievements.
You have completed Track 4 - Only Human
You have completed Track 3 - Forged In Stars
You have completed Track 2 - Tokyo Skies
You have cashed in an Air bonus while maintaining a score multiplier of 10 or more
You have completed Track 1 - Spectra
You have completed Track 5 - Aurora Borealis
You have completed Track 6 - Evolution
You have completed Track 7 - Beyond the Cosmos
You have completed Track 8 - Veteran
You have completed Track 9 - Sonnet
You have completed Track 10 - Sunday
You have unlocked all tracks
You Have looked at your stats
You have completed a track on Hardcore difficulty
You have collected 100 or more pickups whilst maintaining a score
You have completed a track with 50 Successful "Nice!" bonuses
You have completed a track without any collisions
You have cashed in a score buffer of more than 3,000 points
You managed to get a score of 9,000 or more on a track
You managed to get a score multiplier of 15 or more
You have picked up 10,000 pickups
You have a combined best score of 100,000 or more across all tracks
You have completed a track with 100 collisions or more
You have lost a score buffer of more than 3,000 points
you have lost 100 times
You have completed all tracks on both difficulty settings
You have completed all Achievments