"The greatest accomplishment in my career was graduating college as an honor student while still working full time in a related field. I was top of my class while working full time, and that made my accomplishment more gratifying. This success showed me that I could dedicate myself to my career, and reach the goals that I set for myself. It felt great to accomplish so much and receive recognition for my dedication."

"I am proud of having been chosen to be a mentor to new hires in my current department four years ago. I think I've informally mentored and exhibited leadership since day one on the job at my current employer, and to be recognized for being a great teacher and being able to train and shape the new additions to the department is an awesome pat on the back."

It is okay to brag a little when answering this question. Show pride in your career accomplishments, and align your accomplishments with the role you are contending for.

Your example doesn't necessarily have to be groundbreaking. Whether you formed a team for the first time and fostered a great sense of teamwork in a collaborative environment or developed a system that improved workflow and saved the company money, this question is about how you gauge success and what you can bring to the table.