Definitions for overachieveˌoʊ vər əˈtʃiv
Random House Webster's College Dictionary
o•ver•a•chieveˌoʊ vər əˈtʃiv(v.i.)-chieved, -chiev•ing.
to perform better or achieve more than is usual or expected.
Category: Common Vocabulary
Origin of overachieve:
perform better or achieve a greater degree of success than expected
"His daughter always overachieves"
To achieve more or at a higher level of quality than what was expected.