|Description||Destroy no human structures in at least one stage|
|Game||Dr Phlogiston Saves the Earth|
|Orb Points||200||Orb Coins||2|
In order to obtain this achievement you simply have to complete one of the earth stages without destroying any buildings. This includes ramming the buildings and firing at them. You can, however, let the aliens destroy them if you want.
If you stay in the top third of the screen at all times you are guaranteed to get this achievement upon completing the level.