Here is the full list of all 11 Obscure - there are Challenge Your Mind achievements.
I played "Obscure - Challenge your Mind" at least once
I can jump while dreaming! That is pretty cool!
You saw the world in all its beauty!
Your curiosity made you the King of the Lake!
A Mystery old as time itself
Secrets can be found all around you
I wonder why someone would need something like that.
It is that time of the year again.
You visited all the corners of the world!
A way out of this dream?
I was always scared of things like that when I was a child.