I disagree on the rice. I have mined it since december (paddy fields twice a day, everyday), starting at a near completed level 5 then, and i'm now completing the last achievement level. I'm at something like nearly 9 000 on 50 000. In a few months, i will have completed it.
Bamboo, on the other hand, is still horribly high even after rebalance, and there's so few of it to mine...
And let's not talk about herbs. Have this achievement been changed, or will it be? I tried to estimate how long it would require for me to get to the end (i'm at level 6, 11607 / 80000), by mining any that could give it. The answer was 3.5 years.
I'm not taking into account chambers of fortune and temple of fortune, as that would require a constant stream of gem to get all needed green rings - 34 rings / week - but "only" for about 70 weeks. That's about 52 000 gems required, costing a wonderful 1 500$ only to hope having that achievement done in 16 months. So... nope.