To get this, you will need to collect all 8 pieces of the painting and all 8 colour tubes hidden throughout the game. If you press on a level, you can see what collectables are still hidden in the level. If none of the collectables have a star beside the number, you have found everything in the level. If you are stuck, refer to the walkthrough HERE for item locations. This will unlock at the end of the Outro, if you got them all in your first run. You can go back to previous levels to collect anything you missed, and replay the Outro to unlock the achievement when you have everything.