I have one piece of concept art

[Quinneth]

so i just got the last achievement 'hard to the core' and i decided to see what concept art i've unlocked. To my surprise there is all but one image, pretty sure it's there for everyone (it's six washing the guest). I'm not sure if this is because i've only opened the concept art tab just now or not but what have i missed?

[frodogreat]

I didn't get the hard to the core achievement, but I used to have 2 concept art images. Now I have only 1 art image unlocked (the same one as yours) after clear the game again (using a new save file).

[Quinneth]

like i said i never checked beforehand but i might've even had more before I got it like you did, i'm not sure how we're supposed to unlock the rest of the concept art

[frodogreat]

I just found out that, if you start a new game, all the concept arts will be locked.

If you have an old saved game, try to load it and go to the art section again. But if you have already delete it or replace it, then God bless you.

This must be a bug or a design flaw IMHO.

[frodogreat]

By the way, start a new game will also reset all collectibles, so that you can collect them again.

Since the concept arts depends on those, it explains why you see only one image in the collection. I assume you didn't bother to hug the Nomes while attempting the final achievement, no?

[Quinneth]

you're right i didn't, i just checked and starting a new game reset everything, including the concept art. I wish i still had my old save because that was the one I 100%'d all the collectibles on, i'm doomed