Originally posted by HiSaZuL:Ninja for me was a regular round about enemy. So I'm thinking all of those are just random as they get. I got a bunch of those unique kills and it was never against something unique as far as I could tell. Perhaps theres a change when enemy spawns they are assigned a unique name/id that triggers achivement or perhaps entire achivement is simply random. Who knows.
Originally posted by FuriousGeorge:Holy cow I don't want to grind 100+ hours trying to find all research drops! Grrr.