So, imagine you're playing a game with your friends and you win! That's an accomplishment, and you feel proud of yourself for doing well. When we talk about an appeal to accomplishment, it means someone is using their accomplishments to try to persuade someone else to agree with them or do something they want them to do.
For example, let's say you've been studying really hard and gotten really good grades in school. You might use that accomplishment to convince your parents to let you stay up later or give you a reward for doing so well in school. Or, if you've won a sports competition, you might use that accomplishment to try to get your friends to join your team and practice harder to win more games.
Sometimes, people can go too far with an appeal to accomplishment and start to act like they're better than other people just because they've accomplished something. But it's important to remember that everyone has their own talents and strengths, and it's not fair to judge someone based on their accomplishments alone. Everyone has something they're good at, and that's what makes us all special!