To unlock All Star Group Photo you must get S Rank on all missions. Secret Missions:
Besides earning points by killing enemies and for time, you can earn points by completing secret missions below are all the secret missions. Mission 3 - Critical Hit
Near the broken bridge, drop into the water . Point value: 200
Mission 4 - Phantom Baby
Go back into the church where you battled the Phantom. Point value: 100
Mission 4 - Phantom Baby 2
First defeat the Phantom Baby in the secret mission before, then go to the God of Time room. Point value: 100
Mission 4 - The Three Beasts
Located inside room that is under the biplane room. Point value: 100
Mission 5 - One-Eyed Evil
Go back to the room where you first saw Beezelbub. Point value: 200
Mission 11 - Wandering Ghost
Go back into the final room of Mission 10.
Mission 13 - Water Cell
Go to the captain's skeleton in his room. Point value: 100
Mission 15 - Treasure of the Reaper
In the where room you first got the Shield Emblem, look at the skull . Point value: 200
Mission 16 - Stairway of Tranquility
First beat Griffon, then go back to the coliseum. Point value: 100
Mission 16 - Shadow of Darkness
First beat Nightmare, then return to the biplane room again. Point value: 200
Mission 17 - Blue Gem in the Sky
Cross the broken bridge using Air Raide. Point value: 200
Mission 21 - Hidden Bangle
In front of the God of Time statue, look at the wall. Point value: 200