Here is the full list of all 23 Observer: System Redux achievements.
Overdose on synchronization pills.
Complete your first Dream Eater sequence.
Survive Adam’s trapware.
Embrace Adam.
Reject Adam.
Decide the fate of the merging minds.
Decide the fate of the organ farm.
Decrypt Adam’s figurine.
Finish the game without dying.
Interrogate Amir’s clients.
Find all RC cars and recall a memory of Adam.
Find and listen to all patient interview recordings.
Find all roses and discover the final resting place.
Find 10 nanophage patient cards.
Find all nanophage patient cards in a single playthrough.
Interrogate 20 tenants.
Earn 3000 points during a single trapware run.
Analyze 100 objects.
Complete all With Fire And Sword: Spiders arcade games
Find out the lovers fate
Find the source of the distress call
Witness the lost moment
Find out the true reason behind the hanged man's death