Like the "Greenhorn" achievement, you should earn this one in no time. Just remember to stay profitable:
Spring: Potatoes, Cauliflower, Kale
Summer: Blueberries
Fall: Cranberries
Additionally, you may be tempted to sell everything you don't use for a quick buck. There's no right or wrong to this, but if you do, try and keep 5-10 of everything for good measure.
NOTEThis achievement is related to:
Greenhorn: Earn 15,000g
Homesteader: Earn 250,000g
Millionaire: Earn 1,000,000g