Once again, this depends on how someone measures success and achievement but I'm sure alla yous know that already except for the true blue dingleberries floating around these parts. Thank God we have so few of those.
I'm not even sure what it means to "overachieve," I mean I know the connotation with the word: achievement+a feeling of superiority, but when I look at it in more neutral terms it's simply doing better than expected; going above and beyond. How is that type-related? I'm just surprised (well not really) this is so contained to academic achievement.
And then again, even if someone does achieve for sheer reasons of inyoface-ness so the fuck what? As long as they're not stepping on you in the process, stop being a hater. The politics of envy are simply amazing aren't they? I think those who hate on overachievers could just as easily be categorized as spiteful and jealous of the success of others. Let's think about all the people in the world that have probably done massively beneficial things just to prove to someone else they could do it or competition.
So if you're connecting doing well in what you've chosen to do well with MBTI then sure, why not pile it on?
TJs, ExFJs. I'll see you Ps at the valet station. Don't scratch my effing Aston Martin or there will be hell to pay.