FIFA 12
55 Achievements
1,250
50-60h
Pack King
Open 100 packs in FIFA 12 Ultimate Team
50
How to unlock the Pack King achievement in FIFA 12 - Definitive Guide
You can use MS Points to buy Premium Gold Packs, sell them all or pick out the better players and sell them on for Profit on the Trading section. Alternatively, you can play some of the easier Tournaments over and over for Coins.
Unobtainable due to server closure.
Packs can cost from 400-15000 coins or you can buy some with real money. You need to buy 100 packs so the cheapest packs are advisable. However, packs are not the best deal unless you get insane luck and pull a player worth thousands, so it is best to get this trophy after the other Ultimate Team ones so you do not waste your money. You should also sell any unwanted items through trading so you can get more money to buy packs. Packs opened on the web app do not count towards this total. Once you have opened 100 packs (there is no way to track this), the trophy will unlock.
This will come over time playing Ultimate Team. You need at least 40k coins for this (assuming you only buy packs with coins), as the cheapest pack is 400 coins (and 400*100=40,000). Unfortunately, there is no way ingame to check how many packs you've already bought.
Also, if you're not the luckiest person, this will definitely come when trying to get How Great is That?.
I read on the forums that sets purchased through browsers do not count towards this hundred