Ooh. I like that approach. I don't think I've seen a gallery unlocked like that in an H game before.
Yeah, and the gallery will be somewhat of a more fleshed out version of Parasite in City's "gallery", in that it'd have a bit of story and interactivity to it (but if you wanted just the gallery you can just skip all of it).
The achievements should be fairly easy though, but not something you'd do normally, like for example;
- Freeze two enemies, and jump from one to the other without touching the ground, using them as platforms
- Kill 3 enemies at once with your Electric Charge Shot
- Knock an enemy off a platform using your Electric Jump
- Stay alive at 30% or less health for more than 1 minute
Just things I thought up off the top of my head, not too hard to do, but they let you explore different mechanics and things within the game etc.