I removed all the gallery stuff that you can't unlock in the 0.13 demo so all that you see you should be able to unlock. the 0.12 version had more gallery images that you could never reach I'm pretty sure.
I'm just gonna wait for the next update of the demo so that I can just retry again since I have like 8 gallery that are completely lock that I can't access through the quest of each character for that I will just wait for the next update. Not being sarcastic or hating on the game I just feel down seeing that I can't access the remaining gallery or quest that required to unlock them for that I'll just wait patiently and see how the game process especially since this is a great game after all its a 9.5 out of 10