If you go for the other Achievements, this one will come naturally.
No need to build tons of Fields. Just play like you normally would and build some Farms (5-10), also build a Mill and click on the "rebuild automatic"-Button on the right site.
If you wanna speed it up, dont do the upgrades for the Farmes! Because the less food they give, the more often they need to rebuild.
For me, the chevo came, while i was in mid game of the 6th campaign. And i have allways done the upgrades.