perfectionist → τελειομανής, τελειοθήρας, περφεξιονιστής, περφεξιονίστρια, τελειοθηρικός, τελειοθηρική, τελειοθηρικό

[spiros]

perfectionist → τελειομανής, τελειοθήρας, περφεξιονιστής, τελειοθηρικός

Perfectionism, in psychology, is a belief that perfection can and should be attained. In its pathological form, perfectionism is a belief that work or output that is anything less than perfect is unacceptable. At such levels, this is considered an unhealthy belief, and psychologists typically refer to such individuals as maladaptive perfectionists.

perfectionism (uncountable)

A dislike for anything less than perfection
A belief that spiritual perfection may be achieved during life, or that it should be striven for
https://en.wiktionary.org/wiki/perfectionism

[spiros]

τελειομανής -ής -ές [teliomanís] Ε10 : αυτός που επιδιώκει πάντα την τελειότητα, συχνά φτάνοντας στην υπερβολή· περφεξιονιστής1.
[λόγ. τέλει(ος) -ο- + -μανής]
— Λεξικό της κοινής νεοελληνικής του ιδρύματος Μανόλη Τριανταφυλλίδη