I have the same issue and no idea how to solve it quite annoying.

Same for Arkham Origins.
I completed the game, the only thing missing is one challenge which I need to get in NGP.
However, according to GOG I only got 4 achievments, all the rest is missing and that's just not possible (I collected the riddler trophy but didn't get the achievement for collecting all data packages, which are necessary to get in his lair in the first place).

I've been playing Origins and mostly achievements are registering, it's not as bad as it sounds like it is for y'all. But some have also not triggered for me. Including "One Eye Open" which logically I should have since I've completed the game LOL. :) (99% sure I completed "Point Counter-Point" as well, but that's also not unlocked. :( )

I don't know if this is a problem with the Arkham games specifically, or a larger Galaxy bug or uptime issue.

Is anyone having issues with the calendar man achievement? I tried to do this by way of date manipulation but that forces Galaxy to go offline and because of that it looks like the achievement will not pop.

More specifically, do GOG achievements only pop when the game client is online only?

Based on these issues I and others have had - which I suspect are about GOG server uptime, and do seem to have gotten better - I'm pretty sure achievements only unlock if Galaxy is online. Otherwise, these missing achievements should be able to unlock later when the client does go online.

FYI I was able to pull off the calendar man achievement. It did unlock offline.

I'm also having issues with some of these achievements. When I rescued the fourth hostage from Riddler I was supposed to get one but didn't get it. I kept playing the game and finished the AR Training Exercises but didn't get the achievement neither. After that I defeated Deadshot but didn't get the achievement. I even recovered all of the Catwoman's loot from Two-Face's thugs but the achievement "Family Jewel" didn't got unlocked and it was at this point that I noticed that something was happening since I knew about that achievement. I got out of the game and started it again and only 2 achievements got unlocked automatically: "AR Knight" (Completed all AR Training Excercises) and "Intellectual" (Rescue the 4th Hostage from Riddler) but "Family Jewel" from Catwoman and "Contract Terminated" from Deadshot didn't.

Any idea on how to recover those achievements? :C

Hello. So far, both in Asylum and City, I've been getting achievements without any problems. But I wouldn't be surprised if there are some that can't be unlocked. I have seen these problems in other titles, like Danger Scavenger for example. I think it's a Galaxy problem.