Here is the full list of all 10 SHOWMAKER achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Finished recording for the first time On Air.
Placed a back light on the track.
Placed an camera on the track.
Placed an effect on the track.
Placed a top light on the track.
Setup your first stage.
Played a song for the first time On Air.