This can be a difficult trophy. Some silver skill games are easy while some can be tricky. There are 13 Silver Skill games. The only two I had a large amount of trouble with were Free Kicks and Lob Pass. Its possible you may find another tricky too but these are the main ones for most people. The Free Kicks skill game just takes practice to get, so keep trying until you pull it off. For Lob Pass, keep lobbing softly into the front buckets until you hit 2000 or 2400 points in one lob. Then go for the further buckets, if you get one in you'll complete the challenge, if not restart and repeat. After completing all 13 skill games on Silver, you'll get the trophy.