When I was in high school I ran a WC2 league on AOL (AOWL - America Online Warcraft League =P). We only had maybe 100 people participating, but AOL gave me "
Community Leader" status which paid for my account for a couple years. And they let me develop some dedicated screens in the AOL client using their proprietary scripting language, "Rainmain". I thought that was kinda cool.
In 10th grade, we got those Texas Instruments graphing calculators (
TI-82) for math class. I wrote a bunch of games like yahtzee and connect four which got popular in our class. Since the teacher let us use those calculators during tests, I decided to write a program which let you input equations (quadratic equations, etc) and the program would solve it for you. This program was of course even more popular than yahtzee. The teacher, confused at what was going on, began demanding we start showing our work in addition to our answers. So I updated the program to also generate the work. It must've been funny for the teacher to see all the kids tests with the exact same work and answers shown. It wasn't too long before the teacher simply banned the use of the calculators during tests. That was my 15 mins of fame in high school.
I don't know if either of those qualify as "accomplishments", but it's the best I got. =P