Well it must be a bug because I am not able to gather at 3 Star nodes and yet I have that tool thanks to the achievement. Also it would be kinda unfair if you dont need them with the miner but have to gather them with the botanist. (IMO I find the fisher way worse than those two..seeing how much more fishes you need and how RNG it can be..with my luck I will have that one sometimes in 4.0 after the release of better tools)