This can be accomplished via co-op online. There should be a tutorial that pops up around the time that you unlock the ability to play online with people, somewhere after you get to the initial base/village/fort right outside of the jungle. Up in one of the top most areas where you can access the quest log/book you should just be able to queue with a friend after you invite them. Its easier to do this sooner than later...the game gets tedious the more you go solo.