The Stealth Pathogen Achievement doesn't seem to be achievable, at the very least, not after you prestige. I'm at the point where I can advance pretty much as soon as the button appears, but even after speedrunning to Phase 10 in ~30 seconds, without a single containment event even having time to appear, the achievement still doesn't show as being completed. Unless I'm missing something and there's an additional requirement, but if that's the case, it isn't actually specified in the achievements description.