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