Here is the full list of all 23 Observer: System Redux achievements.
Reject Adam.
Embrace Adam.
Survive Adam’s trapware.
Analyze 100 objects.
Witness the lost moment
Decide the fate of the organ farm.
Interrogate 20 tenants.
Decrypt Adam’s figurine.
Find 10 nanophage patient cards.
Interrogate Amir’s clients.
Complete your first Dream Eater sequence.
Decide the fate of the merging minds.
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 roses and discover the final resting place.
Find all nanophage patient cards in a single playthrough.
Overdose on synchronization pills.
Earn 3000 points during a single trapware run.
Complete all With Fire And Sword: Spiders arcade games
Find out the lovers fate
Find the source of the distress call
Find out the true reason behind the hanged man's death