Biggest accomplishment and greatest strengths are one in the same and one of the most common interview questions. The interviewer wants to know that you don't just go to work, do your job and go home. Tell the interviewer about a work accomplishment and what the outcome was. Did your accomplishment positively impact your co-workers? Where you recognized by your boss for a job well done?
"One of my greatest accomplishments was acting as the shift supervisor while my supervisor was out on maternity leave for 4 months. I volunteered for the role, successfully led my co-workers and everything ran smoothly. My boss complimented me for my success and awarded me with the employee of the month as well as a monetary award."