Skull and Bones

This achievement is another easy one to unlock, and you can relish unlocking it with a certain swagger. All you need to do, is locate a Compagnie ship (you could also attack another player, but the A.I. enemies will likely be easier than human opponents) and get into a fight. You use canons and whatever means you wish to battle them, but then, rather than boarding them or looting the jetsam in the waves, simply sail on. Once you leave the designated combat zone, this achievement will unlock.