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