Here is the full list of all 28 PRIMAL DUNGEON achievements.
Kill 20 Green Bushes
Kill 25 Autumn Brushs
Kill 30 hidden enemies
Kill 15 creeper enemies
Kill 20 Snakes
Kill 15 Sharp Stones
Kill 100 Blue Flying Creature
Kill 70 Green Flying Creature
Kill 60 Stronger Flying
Kill 50 Mutant Plant
Kill 40 Patrol Bush
Kill 50 Dragonflies
Kill 40 King Beetle
Enter the Last Portal
Complete the level
Nah nah nah nha, nhi nhi
Complete the First World
Uses 100 Times the Energy Wolf Skill
Die 100 times
Trow 100 Rocks at your Enemies
Collect 20 hearts
Complete all Energy Wolf Upgrades
Complete all the Rock's Upgrades
Where?
Good Job!
Unleash the First Wolf
Prove your Worth!
Only the bests