Here is the full list of all 12 Carnivores: Dinosaur Hunter Reborn achievements.
Start hunt with all equipment, all licenses and with a sniper rifle
Travel marathon distance of 26 miles and 385 yards (42'195 m)
Confirm 6 licensed dinosaurs of different kind during the same hunt
Fill Trophy Room with 17 Tyrannosaurus Rex dinosaurs
Hunt 10 dinosaurs with only one shot using sniper rifle
Hunt a dinosaur using only one shot with the rifle from at least 120 yards (110m)
Hunt 3 Ceratosaurus dinosaurs using the pistol
Hunt a Pteranodon with the crossbow
Hunt 25 dinosaurs using only one shot
Score more than 500 points for confirmed kill
Completely fill Trophy Room with dinosaurs
Confirm your first kill