The achievement goes up for every 20 foods collected, or 10%. You can achieve this naturally by playing solo, to make it easier and have more food. In the "Pumpkins Pasture" scenario you will find this area of the video. Do not operate the levers and you can stay as long as you like killing mobs and making food.
In this same place you can obtain the "Blast Radius" achievement of killing 10 Mobs with a single TNT, if you haven't already.
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Sorry for my bad english, LoL