At the beginning of the first island in the Claire's Sanctuary campaign 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. You can easily see if they counted or not as species detected in the photo are mentioned and add to the total worth of the photograph.
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!
Since Update 1.12 released in December 2019, it's now also possible to also do this with an ACU unit (helicopter) instead of just the jeep. That might make things a lot easier, as the island is easier to navigate with a helicopter. Thanks Greedy136 for the reminder!