Here is the full list of all 17 Wrath of the Roothless achievements.
Finishing the tutorial.
Use your Ultimate attack on an enemy.
Use your Ultimate attack on 50 enemies
Use your Empower ability on every single ability
Beat the boss
Beat the boss on loop 4
Enter the gardens area
Beat your first enemy
Beat each type of enemy
Successfully block an attack with your shield
Kill 100 Ratmen
Kill 100 Hyenamen
Kill 100 Floofers
Unlock your first favor
Unlock all favors
Collect your first crystalized wrath
Collect 2500 crystalized wrath