成就非常高...somebody has a great achievement in a certain industry 取得成功...he received great success in his show. 壹般黎講
achievement 系指壹段較長時間上
某人取得既"成績" success
可以系較短時間既成功...e.g. 今日的會議結果取得成功 大概系咁啦
供妳參考...再詳細d 就要查字典0勒
Both are noun and they are exchangable. Ex. I am proud of my achievement. = I am proud of my success.
achievement is for a particular thing
ex a degree success is more like an adj. you can say : i have successfully achieved .. .. .. (but ppl rarely say that)