|QUOTE (agent00729 @ Saturday, Aug 17 2013, 00:35)|
|Notice it says only explore all los santos and Blaine county. It's possible that there is another achievement for a different island. I'm mean, there's got to be more than 47 achievements in the largest game rockstar has made!|
Have you noticed how Rockstar has always maintained that GTA 5's world is about Los Santos and Blaine County? It is just wishful thinking by now to think there is another island out there somehow. And with the current size estimates of the map, it is already around the same size as the size comparisons given by Rockstar. If there is another island somewhere, the map would be much bigger than they stated, so again it is rather doubtful.
You also need to take GTA Online into account. More islands would make GTA Online even emptier than it may already feel with just 16 players. Yes, they will increase it over time but I expect that the player count will also increase over time once Rockstar starts to take next-gen into account.