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