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.
**As part of the solution if you and your friends have some armor that have the "food reserve" enchantment and evolve to level 3, you can increase this every time you consume the healing potion. 3 food after every 45 secs.**
Thanks - Logicslayer for remembering that detail.
***As mentioned by Panda M4X
“This achievement is buggy.
It only counts 20 at a time - no more, no less. So you have to eat 20 or more food items in a mission and complete the mission for it to count 20.
In update 1.2.0.0 - June 17, 2020, they patched it so the food from the tables in Highblock Halls counts towards the achievement, but it doesn't appear that they've fixed how it counts.
If anyone else has trouble with this achievement, play through Pumpkin Pastures a few times, you should get 20+ easily in that mission, so theoretically it should take less than 10 run-throughs of that mission.“
Please give me feedback if you liked it, and for me to improve my solutions in the future.
Sorry for my bad english, LoL