Working on finalizing Beta 11 so going through all the little QoL/fixes and things to wrap up, and had a chance to look into this one. Turns out all such achievements were meant to work on broken bots, even the odd one out, Assassin, but back in Beta 6 there was another change to how certain stats were recorded, and that had the indirect effect of making broken bots no longer valid for assassin. The effect was documented, but didn't take into account that it would result in that particular behavior being inconsistent with some other achievements. I think I'll just be leaving it as is, with that one exception, since it makes sense for this particular achievement anyway.