Here is the full list of all 11 Observation achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
All the worlds are yours...
Recovered and/or combined all Data Drops
Found Emma's last message in her bunk.
Found the alternate Emma on the alternate station
Remarked on your effigy
Brought the new gift home...
Broke the first law
Reached the Rescue Station
Investigated the jettisoned module EAS-12
Gained access to Universal
Reached Saturn, somehow