IPA: //ˌsuːpərəˈtʃiːvər//
KK: /suːpərəˈtʃivər/
A person who accomplishes a lot, often exceeding normal expectations or standards.
She is a superachiever, always setting and reaching ambitious goals.
Superachiever → It is formed from "super-" (meaning above or beyond) and "achiever" (from the verb "achieve", which comes from Old French *achever*, meaning to complete or bring to an end). The word "superachiever" refers to someone who achieves above and beyond the normal expectations or standards.
Think of someone who goes 'above' ('super-') what is expected in 'completing' ('achever') their goals — that's why a superachiever is someone who excels greatly.
No commonly confused words.