I've just played it, i took the portal to to access new content directly. Is it normal that most of the gallery is locked ? Do i have to start from the beginning ? Also when i tried to access it from the menu, it showed me an error message and crashed the game.
I would expect many more bugs until the hotfix, just gathering bugs from a release.
But yes, the gallery unlocks after you encounter an creature or character.
the gallery crashing from menu, im unsure why. i'd need to get more Crash reports.
if your on pc, go to your save and look for "Unlocked" and just put 1s in every tab to unlock everything in the gallery.