The "keep your hands clean" achievement requires researching artillery before first biter (or pentapod) nest is killed.
Artillery requires military science, military science requires biomass.

I think, biomass could be produced from something on Gleba. Or better yet - harvested from a corpse - a demolisher corpse would be the most in-line with the spirit of the achievement, though a pentapod corpse might be more believable.

Actually harvesting from a pentapod corpse would be a nice bump to the difficulty. One has to not just conquer Vulcanus first, but also Gleba.

Update:
Another workarounds that come to mind are:
1) alternative recipe for military science using artillery shell instead of biomass
2) the simplest and stupidiest way of all: remove military science from the research requirements.

I think I personally will go with recipe modification (I'm too lazy to make an alternative one so will change the K2 recipe).

I solved it for myself by changing the recipe for "biter research data" to use pentapod eggs. It makes up for a very strange production chain (coke must be imported as well, but it is pretty legit. The recipe could even be called "pentapod-research-data" and will be nicely symmetrical to Nauvis. There would be then two recipes for military science.