Here is the full list of all 9 Growing Pains achievements.
Complete level 1 on the Gold difficulty setting
Complete level 2 on the Gold difficulty setting
Complete level 3 on the Gold difficulty setting
Complete level 4 on the Gold difficulty setting
Complete level 5 on the Gold difficulty setting
Complete level 6 on the Gold difficulty setting
Complete level 7 on the Gold difficulty setting
Complete level 8 on the Gold difficulty setting
Complete level 9 on the Gold difficulty setting