If you work hard, be a team player and show leadership, your actions will speak for themselves. There is no need to flaunt your accomplishments. However, always be proud and never apologize for them.
I believe I made this mistake recently. I did the right thing and have been a voice for my coworkers in a good way. However, I feel I flaunted it more than I should have. I will let my work and actions speak for themselves.