Hello! i had same problem. Started play AC Origins in Online mode like 5 min. till game load my dlc then i quit and start play in OFFLINE mode. After 80 hours in offline mode i downloaded program
" game save manager" and i made backup my AC Origins. I decided to open AC origins in Online mode to get Trial of the gods Quest and after that i switched again to OFFLINe mode and my saves dissapeared. It shows only " NEW GAME". thats [censored] me of . So i restore my saved game in Game Save Manager and when i open the game my saves back !!! thats made my day xD so this program saved my life haha. hope this will help someone