The interviewer wants to learn more about your experience level by hearing your definition of your team's achievements and the part you played in their success. Maybe you pushed yourself to your edge, proving that you are stronger and more determined than you realized! Perhaps you want to talk about how invigorating you find this aspect of your work. Describe how this achievement acts as a milestone towards your goals. Talking about your accomplishments will give the interviewer a sound idea of where you place your values. It will also show the interviewer more about your personality and the goals you seek to achieve.