"Although the waves barely covered my knees on this crossing, I still stopped on far bank and looked back to the mainland with a sense of exhilaration. I had made it back to my childhood island.(From Coastlines by Patrick Barkham ).
It seems not to be an example of "what happens earlier and what later",does it? Why did the author use past perfect here? I have some thoughts about the completion of the action. I don't think the usage was covered in the suggested explanation because though there are some examples of completion and they mention it,but there are always two verbs and two actions. What we are having here is one verb,no time reference, but a result of his efforts to visit the island of his childhood,the event he had been anticipating all his life.