Here is the full list of all 28 Hungry Dino achievements.
Complete tutorial
Complete Small Cementary
Complete small dungeon
Complete Egypt map
Complete lake map
Complete field map
Complete Small cave
Collect 1000 PowerUps
Complete any singleplayer level
Complete Cementary on relax difficulty
Complete dungeon on relax difficulty
Complete Egypt on relax difficulty
Complete Lake on relax difficulty
Complete Field on relax difficulty
Complete cave on relax difficulty
Complete cementary on pain difficulty
Complete dungeon on pain difficulty
Complete Egypt on pain difficulty
Complete Lake on pain difficulty
Complete Field on pain difficulty
Complete cave on pain difficulty
Eat dino 1000 times
Eat something 10000 times
Reach 100,000 points
Die 100 times
Complete 10 levels without damaging DINO on relax difficulty
Complete 10 levels without damaging DINO
Complete 10 levels without damaging DINO on pain difficulty