Honestly this achievement feels like a grind. I was able to get this achievement in about 5.5 hours. I built all of the essential buildings such as research, power stations, fossil building etc. towards the top/entrance of the park. At the opposite end I had an enclosure on the right and left side of the area. I built attractions and a hotel in the middle. I also built a monorail from the entrance of the park to the hotel area.
To get stars up initially, I put 3 cera's in with 10 dilos. They work together, but they are incredibly annoying as the ceras often will not allow the dilos to drink/eat so it was not uncommon for me to have to heal the dilos up a LOT. By the time you have these all in an enclosure and you have built up your attractions, you should be 2+ stars.
Be sure to get raptors and t-rex to 100 percent genome when these fossil site come available.
Ultimately, after I reached 3 stars I was able to research and create an indo. rex. Then I pumped out ceras as fast as I could to "feed" them to the rex. The infamy fame will eventually push you over the dinosaur required rating for three stars, even without having enough of a variety. If you need to, you can feed a T-rex prior to getting the indo. Seriously, at least 3 hours of this was just feeding dinosaurs.