This achievement requires you to have 1,000,000 G
Please note that the achievement may not pop until you re-enter the game***
The fastest and easiest way to get this achievement is to farm Peaches, Peaches are the highest level crop and sell for A LOT of G.
To start farming you will need a few items:
1 Seed Extractor
1 Breed Improvement Plant
Any amount of Plantations
1 Sprinkler
and a Market
First, you are going to set up the plantations and place a sprinkler in the middle, a single sprinkler can water up to 16 Plantations by itself.
Then place a Seed Extractor and a Breed Improvement Plant:
Seed Extractor allows you to extract the seeds of a crop for a small cost
Breed Improvement Plant is just the Seed Extractor but has a chance to give you a higher tier crop
Once you have them set up you can start farming, plant the highest level seeds you have to the plantation and use the Breed Improvement Plant to get higher tier seeds until you have a Peach Seed.
Now start planting the Peach Seed to the plantations until you have around 100 Peaches. Now you can turn a few of them to seeds and sell the rest to have over a Million G's.
You can use G's to buy things from merchants which can sell very VERY useful things such as Poison Arrows or Food. Poison Arrows are the best weapon in the game and can kill any boss very quickly with a fast Bow.
Here is a video that visualizes this guide.