noun
a person who successfully attains a goal or accomplishes a task
adjective
describing someone who is successful in achieving their goals
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She is a dedicated achiever who consistently meets and exceeds her goals.
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He's always been a high achiever, getting top marks in all his classes.
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That dude is a straight-up achiever, always hustling and grinding to reach his dreams.
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The marathon runner was an achiever, pushing through the pain to cross the finish line.