PhD application: Writing summary of accomplishments [I am too much afraid to ask this question becuase I think most of you will say that I am too stupid to understand meaning of "Summary of Accomplishments".]

So, I am applying for a PhD position which is asking for "Summary of Accomplishments" letter. What things should be included in it?

Is it about my accomplishments other than my research work or research work itself is an accomplishment? I was teacher assistant in many courses, it is an accomplishment? Should it be written in a list form or in a paragraph form?

In short, what does "accomplishments" mean when PhD hiring committee ask for it?

I am asking this question here becuase I could not find any appropriate answer from Google.
Accomplishments that most potential employees, guides, student application reviewers, etc are looking for are positions, rewards, recognitions, etc that indicate achievements and are demonstrative of work culture, personal capability of setting and achieving goals, intellectual level, skill development, attitude and knowledge, specialization, tenacity, continuity, etc. 

The rough rule of thumb is that 'anything won in a competition is an accomplishment'. 

Accomplishment is also attainment of certain position or degree or diploma or certification gained through some labour, study, test or recognition. 

Hope this helps.