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Relevant actions
Interactions that count towards this achievement are marked by the "Observation" message and the mouse courser turns into a circle to be used for hovering over noteworthy objects. When concluded, you'll see "Observation success!". Any observation of a suspect/witness counts is such an interaction and therefore counts. In total there are observations.
In contrast, the game has investigation screens without the respective message and turning the mouse courser into a pair of glasses - these do not count towards the progress but often are necessary to collect evidence for the case.

Milestones
If you just like to check your progress, orient yourself at the milestones to figure out whether you already missed something.

* Cat's Eye = 1 Observation
Should unlock in:

* Falcon's Eye = 50% Observations
Should unlock in:

* Eagle's Eye = 100% Observations
Should unlock in:


Complete Observation List (in order of occurrence)
In many cases, the order of interactions is mandatory because some locations can not be revisited after the story moved on.