Achieving a major goal or accomplishing a significant feat is a crowning accomplishment. This significant achievement might have been years in the making and served as a milestone for someone's life, whether personal or professional. Some synonyms or similar words that could be used in the place of crowning accomplishment are triumph, victory, success, achievement, breakthrough, or milestone. Similarly, other phrases that could be used to describe a significant achievement could be a momentous event, a towering achievement, a landmark accomplishment, an impressive attainment, or a pinnacle achievement. Whatever synonym one chooses to use, achieving a crowning accomplishment is a great achievement that deserves recognition and celebration.