Here is the full list of all 11 Observation achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
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...
All the worlds are yours...
Broke the first law
Reached the Rescue Station
Gained access to Universal
Investigated the jettisoned module EAS-12
Reached Saturn, somehow