Views relationship working back from a content type
If I have understand your problem, you want display a list of "Curriculum" and inside each "Curriculum" show all observation of this item (like your second screen).

If you aren't blocked by add some module to your project, you can try "views_field_view".

In your View, you create a first display who list all your "Observations" filtred by "Curriculum" nid (like your second screen).

Then, you create a second display who list all your "Curriculum" with a View field who use the first display.