How significant are these achievements?
For example, if you received some kind of outside recognition for your achievement, that’s probably worth a brief update. OTOH, if your club nominated you for something minor, I’m not sure that on its own is worth an email.
It’s a fine line between bothering AO’s and telling them something they probably should know. Run it by us here, or ask your counselor at school if they think it’s worth updating. Whatever you do, keep it brief and to the point.