Assassin's Creed 3 Save Game Location
Windows
Assassin's Creed 3 save games can be found here:
Uplay: C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames\[user_id]\54\
Linux
Linux (Proton):
~/.steam/steam/userdata/[user_id]/208480
Assassin's Creed 3 save games can be found here:
Uplay: C:\Program Files (x86)\Ubisoft\Ubisoft Game Launcher\savegames\[user_id]\54\
Linux (Proton):
~/.steam/steam/userdata/[user_id]/208480