After clearing stage 3, you'll unlock the ability to complete missions as well as Daily Missions. On the world map, press L1 to access the mission menu and press Triangle to see the Daily Missions. You can clear missions up to two days in advance but this trophy will require you to log in at least four separate days in order to clear the required amount of missions. They're usually pretty simple and give you a good EXP multiplier so they're worth doing even if you have the trophies. Once you've finished ten, the trophy will pop.
Along the way, you'll also unlock the following: