Essays / Trouble Getting Started on UC essay about my journey [4]

Tell us about a personal quality, talent, accomplishment, contribution or
Experience that is important to you. What about this quality or accomplishment makes you proud and how does it relate to the person you are?

I am having trouble getting started on this essay. I am planning on writing a narrative essay on my journey up a mountain and how it was important to me. Should my introduction paragraph begin with saying what my accomplishment was and then explaining the story and how it was accomplishing? Or do I omit the introduction paragraph and explain my narrative story first, and then explain the accomplishments?