Here’s a guide to getting all Master League achievements in the shortest amount of time possible:
1. Navigate to the Master League option on the Offline menu.
2. Select ‘New’.
3. On the General Settings page, choose ‘Classic’ club operations, ‘Beginner’ match level, 5 mins for match time and click OK.
4. When prompted, choose to manage an existing team by selecting ‘Club Team Line-Up’.
5. Select Barcelona from the Spanish League.
6. Confirm your manager’s nationality, then on the next screen choose appearance and name.
7. Edit your team line-up. By default for me, Lionel Messi was in the reserves and he should be starting in LWF or CF.
TIP: Save the game now to avoid having to repeat the above process if you lose the first match.
8. Start to simulate matches and saving after each match. Firstly you will win the achievement ‘Won in Master League’ for 10 GS.
9. If you ever lose or draw a match, exit Master League and return to the top menu. Load your last save and ty again. As Barcelona, you will almost always win.
10. Barcelona are in the International Champions Cup so you will gain the achievement for winning that, ‘International Champions Cup Champions’, after three matches. This will bet you 90 GS.
11. After about 10-15 matches you will be prompter to choose your first favourite player. Choose any player to unlock ‘My Favourite Players’ for 10 GS.
12. Keep simming matches and saving after every single match. Exit and reload if you fail to win. If you’re struggling with any match, you can always play it and win very easily. You don’t strictly need to win all the league matches, just enough to top the league. Your biggest rivals will be MD WHITE, which is Real Madrid, so watch out for them.
13. Keep going until you can’t be caught by anyone else in the league, at which point you’ll win ‘League Champions’ for 40 GS. This happened for me after 32 matches.
Congratulations, you’ve just earned 150 GS for under two hours of effort.
If you finish to the end of the season and win the Spanish Cup and the European Club Cup you’ll accumulate a lot of GP for use in the myClub mode.
Credit to johnmiester1983 for his solution to the International Champions Cup achievement, which served as a starting point to this guide.