https://www.youtube.com/watch?v=yxpW2ltDNowOP I think you'll find this interesting. It's a more comprehensive and academic look at that particular topic.

OP I think you'll find this interesting. It's a more comprehensive and academic look at that particular topic.https://www.youtube.com/watch?v=yxpW2ltDNow
Though personally I don't think you can categorize human beings that easily.
My own motivations can change quite drastically over time, and sometimes depends on mood. For example when I am energetic and motivated, my competitive streak dominates and I pursue high scores in vMA and generally try to be efficient in whatever I do, whether it's making gold, PvE or PvP, and I am definitely drawn to titles and achievements like Emperor and Flawless Conqueror etc, so there's definitely an Achiever personality there.
However I also derive enjoyment from beating other human beings in PvP, which I find more rewarding than defeating an AI challenge, so there is a "Killer" streak in there, though I guess I enjoy the satisfaction of beating the challenge, rather than necessarily the anguish it causes my enemy. So maybe not I'm a classic "killer" as defined by Bartle.
Then of course there are phases where I just go full casual/roleplayer mode. Turn off my UI and wander around Tamriel and just enjoy and sights and sounds. I also enjoy theorycrafting, designing builds and trying them out. This is a bit like an Explorer. Finally I'd have quit ESO long ago if it wasn't a social game and I couldn't interact with other social human beings.
I dunno... maybe I'm just weird.