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