How do you answer 'Which accomplishments in your present position are you proud of and why' in a job interview?

Even if you have to tell a little white lie and hate your present position, tell them you enjoyed the position, that you mastered it well (mention any bonus' or salary increases you may have received during this time), got along well with your coworkers and then tell them that you have a great thirst for knowledge and need something more challenging. This will tell a possible new employer that you aren't lazy, take any position seriously and want to better yourself.