'Your greatest achievement' may be part of an answer to the questions - tell me about yourself. If you don’t include this part in your answer, the interviewer may ask about your greatest achievements for getting a clear picture of your career. Therefore, in order to know who you really are, the interviewer would like to assess your career accomplishments. This article provides tips on answering the interview question - what is your achievement? , Career, Job Search & Job Interview tips, techniques and coaching for Job Seekers - Nissim Ziv