LMS reporting for nonlinear courses?

I have a course that is nonlinear, with many branches. The client wants a complete/incomplete report to the LMS. I don't see how a nonlinear course can be "complete" unless Storyline tracks every click and knows when every possible object has been viewed. Am I missing something, or is it not possible for a nonlinear course to be tracked as complete/incomplete? Thank you in advance.

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