Every TES game. Mafia III gave me JUST over 40 on xbox, only because I did every underboss mission. NCAA football series has given me over 15,000 hours, but sports games aren't for everyone lol.
Honestly, I'm USUALLY sucked into games that can be viewed as repetitive by others. I.e., dynasty modes in sports games, Custom zombies on World at War PC/Black ops III PC.
You mentioned Shadow of mordor, i have about 20 so far, kinda burned out but I'm sure itll end up giving me 40.
I just bought Red Dead Redemption 2 about 20 minutes ago, I'm pretty sure i'll get around 80 from it. At least. On the same note, GTA V and the first RDR. And shoutout to the path of exile mentions!