Here is the full list of all 34 GROOD achievements.
Destroy 250 Ironfaces
Destroy 50 Fat Enemies type 1
Destroy the Squid Boss
Destroy the Brain Boss
Destroy the Machines Lord
Destroy the Squid Boss in less than 1 minute
Destroy the Brain Boss in less than 1 minute
Destroy 200 Floating Mines
Destroy 150 Gunners
Destroy 200 Paper Planes
Destroy 250 Rocket Propelled Barrels
Destroy 150 Saw Blades
Destroy 50 Fat Enemies type 2
Destroy 50 snakes
Destroy 200 Wind Up Toys
Destroy 150 Pulsing Enemies
Destroy all the enemies of the Wall
Vist the Woods 15 times
Visit the Bamboo Forest 12 times
Visit the Wind Zone 10 times
Visit the Desert 6 times
Visit the Coast 3 times
Cause 100 million dollars in damage
Cause 1 billion dollars in damage
Cause 10 billion dollars in damage
Die 100 times
Die 1000 times
Love is stronger than a thousand machines
Reach the Abandoned City
Reach the Frozen Land
Reach the Junkyard
Reach the Philosopher's Path
Reach The Swamp
Destroy the Machines Lord in less than 1 minute