Here is the full list of all 19 >observer_ achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Reject Adam.
Complete all With Fire And Sword: Spiders arcade games
Find all roses and discover the final resting place.
Analyze 100 objects.
Decide the fate of the organ farm.
Interrogate 20 tenants.
Decrypt Adam’s figurine.
Interrogate Amir’s clients.
Complete your first Dream Eater sequence.
Find 10 nanophage patient cards.
Decide the fate of the merging minds.
Overdose on synchronization pills.
Survive Adam’s trapware.
Embrace Adam.
Finish the game without dying.
Find all RC cars and recall a memory of Adam.
Find and listen to all patient interview recordings.
Find all nanophage patient cards in a single playthrough.
Earn 3000 points during a single trapware run.