While building your tour, remember the basics; have food and water sources placed accordingly to maximize how often the dinosaurs are in view of guests.
Unlike Jurassic World, the cable fences of Jurassic Park allow guests to see dinosaurs through them, so long as the dinosaurs are close to the fence.
The Achievement will unlock once the last dinosaur species is added to your park, mine unlocked as the helicopter was dropping off a Spinosaurus.
This Achievement does not require you to have Raptors in your park, and given the lack of ACU helicopters to provide rapid response that’s a good thing. I had every available species except for T-Rex and Raptor.
With the carnivores, ensure the edges of their paddock are right next to the path the tour vehicle will take to make sure they’re counted toward the Achievement. And with all species, keep their food sources near the path of the tour vehicles to keep them in view of your guests.