Here is the full list of all 10 Live Wallpaper Master achievements.
Create 15 wallpapers
Submit 10 wallpapers to the Workshop
Update 5 of your wallpapers in the Workshop
Create your first wallpaper
Submit wallpaper to the Workshop
Create wallpaper with more than 10 layers of animations
Download 5 wallpapers from the Workshop
Give 5 wallpapers a thumb up or thumb down
Download 20 wallpapers from the Workshop
Give 20 wallpapers a thumb up or thumb down