This achievement requires you to purchase a gold player on Ultimate Team for 15,000 or more coins using the buy it now option. This can be boosted with a friend. Simply list a bad gold player for 15,000 buy now. Tell your friend the information such as name, team he plays for, league the team is in, formation etc. Also tell him your club name. This allows you to identify your friends card. Once this has been done purchase the card using the buy it now option. After this is done you should get the achievement. You should then re-list the card to help your friend get the achievement and most importantly get your well earned coins back.
Note: EA tax each auction by 5% so you will each lose 750 coins.