In a single year, produce at least 2000 food each from hunters, gatherers, fishermen, pastures, fields, and orchards.
This achievement requires that you produce 2,000 food from each of the food production buildings listed above.
This essentially requires you to have enough buildings of each type. Check your town hall to see how much of each is being produced, and build accordingly.
Make sure that you're optimising your buildings:
- fishing docks by building them next to lots of water.
- hunting cabins and gatherers huts by surrounding with as much forest as possible
- pastures, crop fields, and orchards by having optimal workers & size (see this calculator)