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