Your most crowning gaming achievement, online or offline.
For me, it's not actually accomplishing any goal in a game, or showing any great feat of skill. It's actually the day that I rediscovered Tyrian. It was my favoritestestest game EVER as a kid (Like, under 5.), and I had dreams and memories that made it seem like pure magic, but I really didn't remember anything about the game, and had no clue what it was called. I searched for it all the time, and it wasn't until early 2010 that I found it again. Playing through that game again was like the best moment of my life, easily. I still haven't beaten it though... it's really hard later on lol.