After our first interview with Immigration for my wife's Green Card status. It seemed everything went fine. However because my wife passport shows that she's also visited other countries in the past, they are asking us to document the time and dates when these other vacations happened and took place. We have 84 days to re submit the information for review. Should I be concerned?

Only if you don't submit the requested info... or if she was visiting terrorist camps... (that second part is meant to be a joke).

Its routine and just be honest... they will already know some of the information.

Submit the documents asap, if you're late, the case will be closed.