Here is the full list of all 10 LGBT Color by Number for Adults achievements.
Open the game.
Color your first picture.
Color 10 easy pictures.
Color 10 medium pictures.
Color 10 hard pictures.
Use Magic wand 5 times.
Use Bomb 5 times.
Use Color splash 5 times.
Use Tornado 1 time.
Color 3 pictures without using boosters.