Origin: Latin suffix -ment
Achievement has 2 different meanings across 1 category:
the action of accomplishing something
"Her biggest achievement was finally climbing the mountain she had dreamed about since childhood."
The act of achieving or performing; a successful performance; accomplishment
"After years of practice, her first published novel was finally recognized as a major literary achievement."
In plain English: An achievement is something you successfully do that shows you worked hard and reached a goal.
"Her biggest achievement was finally graduating from college with honors."
Usage: Use "achievement" to refer to a specific success or accomplishment that results from effort and skill, such as graduating from college or completing a difficult project. Do not use it interchangeably with "achievement" when you simply mean the act of achieving something in general without a concrete result.
The word "achievement" comes from the Middle French achevement, which originally meant "the act of finishing." It entered English through the verb achieve combined with the suffix -ment.