mhacdebhandia
Explorer
The Paizo Publishing forums are probably your best bet. I can tell you, though, that each Adventure Path is a standalone series that could be connected - references are made in the Age of Worms and Savage Tide Adventure Paths to events that occurred in the city of Cauldron during the Shackled City Adventure Path, for instance, but there aren't many direct connections. If you haven't played through Shackled City then it was clearly some other group of heroes involved in those events. There's a reference in the second Savage Tide adventure to a festival commemorating victory over the villain in the Age of Worms storyline, but it's not like you need to know all about that.