My friend's file had only "Met" status. Then it went straight to "Passed" after the Officer made the decision.
There are many insights that we can get from the file. For example, I see that the status of the assessments, particularly "Eligibility" changes multiple times throughout the process, meaning that if you call CIC, you might hear different information on the status of Eligibility, depending on when you called.
In the friend's file, Eligibility had the statuses such as "Not started", "Passed - Candidate", "Review Required", "Met" and "Passed".
Most of the times, these statuses don't mean anything at all as they change through basic point recalculation. Btw, "Review Required" also doesn't mean anything in his case as, it is my assumption, that for everyone's Eligibility will have "review required" right before it has to be evaluated by a person.
The only time when "Review Required" is actually important is when the agent checks Eligibility and puts this status manually.