I think you can do a self-guided tour of the Acropolis. There are tour companies that are good and will tell you what you are seeing but at a cost and you'll probably be in a large group of people.
I've never seen audio headsets at the Acropolis so they may not be available.
There are numerous guide books available for the Acropolis that will help you understand what you are seeing.
There is nothing wrong with taking a guided tour but if you do-it-yourself you can go at your own pace, stay longer at a certain spot and just wander around at your leisure.
It all depends on comfort level, convenience, budget and whether you want to be in a large group of people that may not move along as fast as you like.
Either way the Acropolis is a World Class Site and so is the museum.