Open Roads

I thought this might be tied into making sure that you interact with ALL of the items inside (and outside) the mobile home during the ‘mobile home’ chapter.

However, it appears that’s not the case at all, and it doesn’t matter how many (or how few) items you’ve interacted with during the chapter, this achievement will just pop as part of the story progression at the very end of the chapter when you choose to ‘leave’ the area and get back on the road again, meaning that this achievement is unmissable!