This one wasn't obvious. I was doing events against ghosts and it wouldn't unlock. You actually need to do Skills.
Press Options, go to Activities and pick any discipline.Browse right to the Skills section and pick See Leaderboard against any of them. Pick a friends score and then aim to beat it. Doing so will unlock this.
If you have no friends with the game, you should be able to get a score and then redo the challenge to play against a Rival (AI) Ghost. Beating that will get the trophy