If you're playing the world on Peaceful, you can easily get the "Ahoy!" trophy, by going to these coordinates:
X: -260, Y: 65, Z: -478, now it's on the same map that you load/spawn/whatever on. You can use the Creative Glitch to get a map, or you can go to the tutorial world for a Shipwreck & find one there, OR you can play legit survival long enough to get a map.
Some rough directions on how to get to it: Turn around 180, (just face backwards) from the sand biome you see in front of you as the world loads, run roughly straight for about 682 blocks. Now then look to your left go about 420 blocks,
as you are doing this, you should see ice, water, snow biomes generally based on if you went the correct way. While facing the left you'll see the body of water, traverse to the other side of it & you should find the
You must login or register to view this content., Ice Biome, & just a short way through maybe, 100 blocks, you'll find the shipwreck at the above coordinates.
Alternatively, you can load the world
-3165377875558082103, with normal settings, just enter the seed & create the world on easy, & you'll pop "Ahoy!" immediately.