FIFA 12
55 Achievements
1,250
50-60h
Marquee Signing
Purchase a Gold Player from the trade market for 15,000 or more coins using Buy now
30
How to unlock the Marquee Signing achievement in FIFA 12 - Definitive Guide
Then once thats given you the achievement just put the same player back up for the same price so that your friend can get their card back and you get your 15000 back aswell as this will give your friend the achievement aswell when they buy it back.
Unobtainable due to server closure.
For this trophy, you need to have 15,000 coins. Search for a player you would like (better players will cost more) and purchase it through buy it now, however if you do not want to lose your coins, then you can boost it as either one of you need 15,000 or more coins. The one with the player needs to put any gold player on the market for 15,000 coins and the one with the coins needs to buy it, Then simply reverse the process. Both of you get the trophy, and you both get to keep your items.
For some money making tips, visit Rawra's thread here: LINK
For this you need 15,000 coins or a friend with 15,000 coins. If you have 15k yourself just buy a Gold player which you want for at least 15k coins. If you don't have it but a friend does, put a Gold player up for sale with a Buy Now price of at least 15,000. Let your friend buy him and then let your friend put him back on the market for 15k again for you to buy. Now you buy him. Achievement unlocked.