Thanks, but I know more than those three need expansions, so I looked it up on the PS blog and linked the rest to their appropriate booster packs. Looks like it's just 12 extra trophies, four per booster pack, so there are 45 trophies required to get the platinum trophy. Now I just need help placing the rest of them to the empty spots.
An interesting additional note is that each of the booster packs offer three silver trophies and a gold trophy.
Edit: Having just passed the threshold for level 4, I can say that you need 70 trophy points to reach that point with the Bronze = 1 pt, Silver = 2 pts, and Gold = 6 pts scale.