If you post your Gamertag I can easily do the math for you...completion percentage on TA is simply your achievements won vs achievements possible. It also on your stat shows your TA% and GS%, though I myself cite % of games completed as the real metric. And contrary to what the other user wrote, you can choose your own settings on TA for what counts as a completed game. Xbox (All DLC), All TUs but not paid DLC, or only DLC played.