"Destroy Trees By Impact" Means: Ram Through Them With A Car Or Tank.
- Tank Is Better, Plows Through Trees WIth No Damage To The Vehicle.
If You Hit A Tree With The Car, And It Doesnt Break, Keep Spinning Your Wheels.
- The Tree Takes Damage While You Do This, And The Car Does Not.
Achievement Pops After 100 Trees Are Destroyed This Way.
Good Luck!