I recently completed Assasins Creed 2. I completed the second half of the game offline though. I then went to my dads and recovered my gamertag on his to play COD on my account. As expected I only had half the gamerscore from AC2. However, when I got home and went signed in, I still only had half the gamerscore. I went into my game and I was where I had left it, game completed. I tried doing some of the easy acheivements again, I threw 300 florins on the ground but didn't get the acheivement, and I obviously can't do the questline ones cause I've completed the game.
Short of deleting the history of the game, does anyone know how to recover this gamerscore?
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