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