At the beginning of the first island you get a popup giving you a secondary quest to photograph all the species on the island.
Command one of your Ranger jeeps and start taking pictures of them. It doesn't matter how they are, how much money they give, as long as every species is in one of the pictures you complete the mission and get the achievement.
Take command of a jeep by pressing A on it, then "Drive Vehicle". LB opens the camera, and A is used for taking the screenshot.
Completing this quest results in being able to create a Tyrannosaurus Rex on the second island. So it is recommended to always complete this quest, to make that island easier!