You can get this by pressing
to get on your tractor (it needs gas from a fuel pump or gas station first), then press
on an open field to plow the land on 9 tiles at once. Then press
and pick a crop, and plant it with
on all 9 tiles at once. Lastly, constantly press
to eternally water the plants until you run out of fuel and are forced off your tractor. In which case, refuel and return to the endless watering.
I would advise you to leave this for later and build up at least 25 Medals for a Gas Station first. Then place your gas station and water a 3x3 grid of 9 tiles directly next to it so you can refuel right away.
1 or 2 full tanks of gas will get you 1% of the way towards your Achievement, have fun!