Here is the full list of all 18 FRACT OSC achievements.
Remember my song
Commited to a wave
A potent kit indeed
Fly through the wreckage
A high mountain vault
Fly behind the mountain
Modulation memory
A telling dead end
A brave basin drop
All the choir is here
A forgotten dig site
A crystal crevasse
A crystal den
Power User
More choices ahead
A vital dam plunge
Fly over the dig
A dome from the past