Synonyms of achiever
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doerIf you refer to someone as a doer, you mean that they do jobs promptly and efficiently, without spending a lot of time thinking about them.
• He was a doer, not a thinker.
Thesaurus for achiever from the Collins English Thesaurus
A high achiever is someone who is successful in their studies or their work, usually as a result of their efforts . A low achiever is someone who achieves less than those around them.