Here is a guide for 11 miscellaneous achievements around Paradise Killer, with this one being the sixth one.
1. If you go to the yacht in the north-west end, and take the elevator up, there is another elevator right there that would bring you to the top of the building.
2. Climb the ladder, and there's a statue here.
3. If you face it, then do a 180, look down off the building. You should spot a blue gem way down below, but on a ledge of the building.
4. Grab it, return to the statue, and use it.
* I don't know if this gets you the achievement. It did for me, but I don't know if you have to do other statues. If so, there is one in front of the convenience store by the apartment buildings. The gem is behind the building. Let us know if you figure it out! *