Here is the full list of all 17 Grow Defense achievements.
Defeat 5 Unique Mega Bosses
Finger Bang the screen over 100000 times
Reach Mastery Level 3
Complete 10 researches
Max out Rockets for the Rocket Launcher.
Complete round 200
Max an Items Level
Find your first legendary item!
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.
Defeat The First Boss.
Fingerbang the screen over 100 times
Max 5 Legendary Items