I'm currently having this problem as well. Also, I'm not connected to their leaderboards while ingame too.

Yo Cas! Funny I find you here. I have been having the same issue. I also had this problem with Arkham City. Many of the side mission related achievements are not unlocking for me.

Same here! I 100 percented most of the sidequests, but some of their achievements are still locked. So I did some googling, to see if anyone else had the same problem and I found this old Steam discussion about Arkham City. Some folks were having the same problem with that game (as well as Origins). If you're playing with a 360 controller, this one guy suggested doing this:

'For some reason if you start the game with an xbox controller plugged in, it defaults to offline mode. To make unlocking achivements work again, you have to start the game with your controller unplugged and then plug it in after the game is loaded. Hope this helps!'

It sorta made sense to me, seeing as how I sometimes start the game with my mouse, before actually turning on my 360 controller in the main menu, instead of using the controller to start it through Big Picture Mode. Figured I'd just give it a try and sure enough, the achievements started popping up again as I finished more quests. Not for the ones I already finished, sadly, but I can always try again in NG+. Not sure if it was just a coincidence, though. And I only tried it once. Just thought I'd share!

Originally posted by Jordi:

Same here! I 100 percented most of the sidequests, but some of their achievements are still locked. So I did some googling, to see if anyone else had the same problem and I found this old Steam discussion about Arkham City. Some folks were having the same problem with that game (as well as Origins). If you're playing with a 360 controller, this one guy suggested doing this:

'For some reason if you start the game with an xbox controller plugged in, it defaults to offline mode. To make unlocking achivements work again, you have to start the game with your controller unplugged and then plug it in after the game is loaded. Hope this helps!'

It sorta made sense to me, seeing as how I sometimes start the game with my mouse, before actually turning on my 360 controller in the main menu, instead of using the controller to start it through Big Picture Mode. Figured I'd just give it a try and sure enough, the achievements started popping up again as I finished more quests. Not for the ones I already finished, sadly, but I can always try again in NG+. Not sure if it was just a coincidence, though. And I only tried it once. Just thought I'd share!

My hero, finally got Requiem of a Killer to pop after the 4th attempt. Had tried a couple times after a Steam patch where bulk buying trading cards wasn't working, so thought maybe it would be a late pop like some achievements do on console. Was also having Xbox One controller issues half the time loading up the game.

Didn't want to try the HID disabling, Big Picture Mode didn't help, verifying files fixed 1 but then didn't pop the achievement on 3rd success. Finally, plugging in controller after game launched has (knocks on wood) fixed Requiem of a Killer & controller issues. Now just need to complete New Game+