verb (used without object), overachieved, overachieving.
to perform, especially academically, above the potential indicated by tests of one's mental ability or aptitude.
to perform better or achieve more than expected, especially by others.

1950–55; over- + achieve, or by back formation from overachiever

overachievement, noun
overachiever, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
overachieve (ˌəʊvərəˈtʃiːv)
(intr) to perform (for example, in examinations) better than would be expected on the basis of one's age or talents

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
There's one in every office: that know-it-all overachiever who comes in early,
  stays late and kisses up to the boss.
Suppose you are an overachiever who has run out of things to achieve.
Not an exceptional athlete, but a dependable overachiever who gets the job done.
But remember he was an overachiever on the racetrack.
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