No, but I do set goals that I like to work towards. For example, I've never even tried to complete the pokedex, even back when there were fewer than 300 pokes. Most of the games I play are multiplayer so you can't "complete" the game.
What was the level in Sunshine? I never played the game, but I might soon. Watermelon?
The watermelon level was the eighth shine sprite level: "The Watermelon Festival" in Gelato Beach.
Not 100% xD More like 90% :3
I start 100%ing a game, and then get bored because I'm doing the same level over and over again, so I just like give up and carry on :3