What's the difference between a milestone and an accomplishment?
A milestone represents a (very significant) step along the way; an accomplishment is a triumph in and of itself, even when it is also a milestone on the way to something else…
They are sometimes used as synonyms, however a milestone is a great accomplishment.
A milestone is more significant than an accomplishment. You accomplish something when you finish it. I accomplished combing my hair this morning. I wouldn't call it a milestone.
But don't just take my word for it:
Alternatively,