Pretty simple. Post your gaming achievements you are most proud of. Something like getting every trophy in Super Smash Bros, or like beating Super Mario Bros 3 in under 30 minutes. Those may be weak examples, but you get my drift.
My best accomplishment was pitching a no-hitter in RBI Baseball 93 on the old Sega Genesis. I had Greg Maddox on the mound, and managed to scratch out a run in the 9th to win the game 1-0.