This achievement has now been fixed (as of title update 22.01.2014) - meaning the below solution is no longer necessary. An additional task (create a new squad) has been added so that it can be unlocked on 360 and Xbox One.
This is currently the ONLY way to get this achievement on X1 if you previously got it on 360. Deleting your team will not remove your status as an FUT founder. All it does is reset your Seasons position to Division 10 and sets your record to 0-0-0 - your leaderboards, seasons completed, trade profit etc. are ALL retained.
This achievement is a straight forward completion - you just have to complete the 13 manager tasks.
This is complicated however if you have already unlocked it on 360.
If you have already unlocked it on 360 you have to delete your team on X1 and create it again. You can only delete and recreate your team 4 times, though this won't affect most people.
If you play FUT a lot, the best thing to do is sell absolutely everything outside your main squad. Now create a silver account and transfer the players across (this must be an X1 FUT profile - you cannot trade to a 360 FUT account). Alternatively you can transfer everything across, though the more cards you transfer the longer this whole process will take.
You can also only transfer to an account that you're friends with. If your second account appears on your leaderboard (and vice-versa) then you know they are tradable.
If you have a considerable number of coins, the best thing to do is buy IF players - especially newly released ones, as they will retain their value and even gain some. The problem with transferring coins is that you lose 5% each time - so 100k to a second account and back will leave you with 90,250 coins by the time you have it back...
I should also note that if you got the pack on 360, you will not be awarded with a second one on X1 - just the achievement.