18 2 1Actions Report Solution This Achievement should come naturally while you play the Game. You can explore nine underwater shipwrecks, if you search for all the treasures there you are way over one nmi.Showing only comment. Leave a comment. If you're REALLY bored, you can just swim around a fair sized body of water for like 30 minutes and unlock it like that.Posted by Onyx Grimoire on 17 Jul 15 at 04:17 Leave a comment