For This One I Picked Lumberjack. (Spawns More Trees)
Get One Tree During A Shop Phase (Spawns More Tress During The Wave)
- Head To The Top-Right Corner And Stay There The Entire Wave.
- Be Careful, Lumberjack Breaks Trees In One Hit.
Trees Will Spawn And If You Don't Leave The Corner, You Won't Break Them.
- If 10 Or More Are On The Map At The End Of A Wave, Achievement Pops.
Good Luck!