For this one, you will have to gain entry to Victoria Chase's room.
Starting from the dorm entrance, go to Max's room down the hall to your right. There will be a marker saying so. Also, notice that Victoria's room is across from Max's but is un-enterable.
Once you enter Max's room, find and look at the post-it note on Max's desk.
Go over to Dana's room where her roommate Julia has just stormed out and locked Dana in.
Talk to Julia and say her full name correctly (Julia Watson) when prompted.
If you don't, rewind back and try again and choose the new dialogue choice "Julia Watson, be nice".
Go back to Victoria's room which is now enterable and on entering, turn around and look at the wall of photos to the (now) left of the doorway.
Mess Up the photos.
Photo the new con-finger-ation.
And you'll get this trophy!
Congrats!
If you're playing via Collector's Mode, then you want to select the Girls' Dormitory.