This is a pretty simple trophy.
In the main menu, select the "Community" tab. At the very bottom select "Search More..." Then select "Newest Levels" in the bottom right column.
Just select a level that has less than five playthroughs. That is the number next to the car.
After you complete the level simply write a review for it. A couple of words will do. I also used a couple of tags just to be safe.
Simply finish the review and the trophy is yours!