Here is the full list of all 12 Telluria: Forebodings Demo achievements.
Click on xxx photos folder
Rummage through all books
Search all options on T-Net
Throw a snowball at the camera
Open water in both Ages
Light all the fires in the game
Complete the Temple and Church levels
Activate Standing Stones in both Ages
Get the Pyrite Talisman
get candies for yourself
Climb to the max height
Find the lost souls