After finishing the missions I went about making a complete tour through the park that featured all of the dinosaurs. I had 95% visibility and had all 24 species on display. The achievement didn’t unlock. I took the advice of others and basically restarted the entire island. Killed/Sold all my dinos. Destroyed all existing structures and rebuilt the entire island to focus on Thai one achievement. I now have All 24 species on display with a total of 90 dinosaurs and 6 Pteranodons in the park. My tour has a visibility rating of 99% and all 90 Dinosaurs can be seen. The achievement still won’t unlock. I have closed/opened the ride. Rebuilt the track. Closed and opened the park. Nothing works. Please, I want this dang achievement.