For this achievement, you have to earn 100,000 XP to achieve Level 7. To do so, just follow these steps below:
--First of all, you can only earn XP by using your "Created Golfer."
--XP can be earned by playing in the PGA Tour Season, Ryder Cup, Online Tournaments, GamerNet Challenges, Play Now, TW 2011 Demo, Inviting your Friends to Play the TW 2011 Demo, and TeamPlay.
--Here is a list of some of the ways you can earn XP:
-FIR: 5 XP
-GIR: 10 XP
-Long Drive: 10-20 XP
-Long Putt: 20-60 XP
-Birde: 25 XP
-Eagle: 35 XP
-Reach The Green In 1 On a Par 4: 15 XP
-Hit The Pin: 15 XP
-Close Approach: 15 XP
-Hole Out: 90 XP
-Course Record: 50 XP
--If you would like to earn XP faster, then follow the steps below:
-Once you complete the last Skills Challenge against Tiger Woods, you are given the option of replaying the last challenge.
-Replay the challenge(which should only take you around 3-4 minutes per play) and once you complete the challenge, you will earn around 5,000 XP(2,500 XP from completing the last challenge & 2,500 XP from completing all the challenges).
-Keep replaying the challenge until you achieve whatever Level you want with your "Created Golfer."
*NOTE: Credit goes to Stewie Griffin2 from x360a for finding the XP exploit within the game.
Achievement Unlocks as soon as you hit the 100,000 XP mark.