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