Use Builders To Clear All Of The Trees From A Map.
I Advise Doing The First Map.
- It Could Be A Glitch, But I Did This On The Third And Fourth Level (Main Street And Mall Maps) And It Did Not Count.
- I Did This On The Second Level As Well, But There Appears To Be The Chance For Trees To Spawn Past The Level Exit, Which - If You Touch, You Will Take.
At Least Each Tree Pays For Itself, Achievement Pops When The Last Ones Felled.
Good Luck!