achiever
noun
a person who achieves much, or one who achieves things in a specified way or to a specified degree (often used in combination).
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Asked if, as a result of his research, he’s now a super-achiever, Gollwitzer breaks the auditory equivalent of a smug grin.
From The Guardian ● Dec. 6, 2015