If you want to get the trophy really fast you can use a second account, or ask a friend, to play your level as many times as you need (I got mine after playing my level 20 times with my old account).
You should publish a really fast level, a leaderboard with the spawn point in the top, so it doesn't take you long.
I would recommend you to get the plays by different players, especially if you are planning to complete LBP2. By doing so, you'll get
the first time you enter your pod in LBP2.