They should get easier.
Sea of Thieves has a lot of Xbox Achievements, and many of them are incredibly difficult to earn. Recently, one gamer spent over two thousand hours in order to get a hundred percent completion. This seems quite excessive because no game should require that much time. There probably isn't even two thousands hours worth of content in Sea of Thieves to begin with. Even The Elder Scrolls V: Skyrim requires less time.
Full story from the WindowsCentral blog...