feather in (someone's) cap

Translations
достижение, которым можно гордиться
Winning the award was a real feather in her cap.
Получение награды было настоящим достижением, которым она могла гордиться.
Definitions
A feather in someone's cap refers to an achievement or honor that someone can be proud of, often signifying a notable accomplishment or success that enhances their reputation.