Are you an overachiever, an underachiever? Perhaps you are a high achiever surrounded by low achievers. Surely no would could call you a mischeiver.
All of these titles have the shared root from the Old French word "achever" (to finish, accomplish, complete), which comes from combining "a chef" (at an end, finished), which came from latin's "ad caput" (to come to a head). The last word may be made up, but its obvious parent "mischief" can be said to share the same root as achieve.
A prefix is a hell of a thing! Over- and under- have a clear affect on achieve. Their addition means that someone comes to a head or finishes above or below what is expected or the average. Mis- (badly) suggests that a mischiever finishes badly or who has created bad results.
Along with the use of mischiever, I'm going to suggest slapping on some other prefixes:
- Antichiever: Hypothetically, someone who is against or opposes achievers or the concept of achievement itself.
- Nonachiever: Someone who does not achieve or does not actively pursue goals or success.