Achievements aren't always something you can hang on the wall of your office. Sometimes an achievement is completing a difficult task and overcoming the obstacles that come up along the way. You have a couple ways you can answer the interviewer's question: Discuss an example of when you overcame obstacles to achieve something great, or share an accomplishment or award you received and talk about what was challenging about it. Either way, you are showing your determination and focus to reach your goal. Think of a situation that highlights your strengths and qualities that will be helpful for the job you're interviewing for.