You can find the streetie trophy by beeing friends with all the streeries.

Well, I am friends with all the Streeties, yet I can not find the trophy. I found the
Nerdie and Artsie trophy though. One of the trophies are in the tree in the parking lot of
the carnival, and the other is somewhere in the graveyard chamber with all the tombstones
after you complete mission 4.

you go to the carnival and go to the parking lot that have a tree.

*** all the girls from every rep and leader of the group gives you it