Here is the full list of all 17 Grow Defense achievements.
Max 5 Legendary Items
Defeat 5 Unique Mega Bosses
Finger Bang the screen over 100000 times
Find your first legendary item!
Reach Mastery Level 3
Max out Rockets for the Rocket Launcher.
Complete 10 researches
Max an Items Level
Complete round 200
Destroy your first Mega Boss
Reach Experience Level 40
Have 1 million gold in your pouch
Complete your first research
Stock up over 50 gems
Unlock the mage tower.
Fingerbang the screen over 100 times
Defeat The First Boss.