A ternary system is clearly not enough to accurately reflect the differences between people, rather a quinary system is required. On a scale of clearly introverted, somewhat introverted, ambiverted, somewhat extroverted and clearly extroverted, I find myself in the first camp. :p
I'm somewhat positive to achievements. They are as far as I'm concerned strictly for personal use, although I can like to see the 'global' statistics that Steam offers. I actually don't mind achievements based on how far you've come into the game for two reasons: firstly, they serve to remind me of roughly how much of the game I got through before I quit, and secondly because I find the drop of rate interesting when it comes to the global statistics.
Other statistics I like are those for actual achievements (I did it!), because they can offer additional challenges that can be fun to try to achieve, as well as--once again--because they aid my failing memory (did I kill the optional super boss?). Achievements can also be used to encourage alternate ways of playing the game, which can be a bit of a carrot, although there are often other ways of doing so.
What I don't like are pure grinding achievements (kill 100k monsters, gain 10M gold). At best, you'll get these just by making your way through the game, at worst they'll just try to encourage you to continue playing the game once all the actual new content, challenges and fun to be had are already over.
I hardly ever bother to get all the achievements. If I'm no longer enjoying the game, I wont push myself just to get the achievements I haven't got yet.
Post edited September 26, 2018 by MightyPinecone