EDIT: With the servers shut down for this game, this trophy is no longer obtainable.
After completing a few missions, you will be given a score to beat in the following levels you play. If you manage to beat the score, in the level afterwards there will be a body that is searchable, interacting with that body will unlock this trophy. If you don't think you will beat a score you can quit before the end of a level and will get the same score to beat again.