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