Atomicrops

Year: 1 or 2 (Playing on year 3 or higher will cause weed monsters to start appearing on the farm and might make going for this achievement more difficult.)
Helpful Upgrade if Found: Squaredown (This upgrade will cause weeds to grow faster)

This achievement is pretty straightforward, I did this by getting the Wacker Tractor as soon as I could and tried to get as many charges as I could for that tractor during my run. I made sure not to get any upgrades that would cause weeds to turn into flowers or any upgrades that would allow the farm animals to turn weeds into flowers. I also waited until later Summer early Fall (basically when the farm was suuuuuuper full of weeds) before I used any charges on the tractor in order to give myself the best chance to get as many weeds as possible. Then when I felt like the farm was full enough of weeds, at the beginning of the day I used the tractor to cut them.

Edit: I got this achievement shortly before the Doom and Bloom update came to console.