Just had a look, turns out there are three I didn't get:
In the Maid DLC, earning silver and gold in "Rift Plane Unlimited Time Attack" and in the Spy DLC, the Rift Plane Health Time Trial.
I traded it in when they announced it was going to be on PS Plus so will give them another go at some point
Completed Persona 4 Golden today with the True Ending. santashi said that he hopes Persona 5 comes to Vita as well rather than a home console and I must agree, brilliant stuff.
Put so many hours into the Vita that it has also been a superb investment for me too, magnificent piece of kit.
PSN ID & Xbox Gamertag: Wedjwants