Achievement app not working

Same issue, started while playing Shadow of Mordor. After spending ~4 hours on the phone with Xbox support, we have confirmed that it IS an account issue, not related to the console hardware/software, or connectivity issues.

All achievements for XB360 are visible still, but whenever I try to access the achievements app on Xbox One I get the error code "0x87c40011".

Tech support said that they are aware of the issues and trying to resolve it, but has no timeline on how long it will take.

All of the above for me too! Code and all!! Hope it is fixed sooner then later.....

I think you simply fail to understand why it frustrates. There are simply too many times that one is required to "wait for support". Just the last week alone, we had to wait for support twice in the space of 3-4 days. If 24-48 hours is what you need to wait
each time, and assuming one waits the full 48 hours each time, that'd be 4 days of waiting time in a week just to wait for achievements to unlock. That is unacceptable service however you see it. Whatever "support" fixes is not fixed permanently, and you'd
never know when you'd get another shock.

It's great you had your achievement lottery moment. But I've not had mine and it's approximately 31 hours now. That's 17 hours more to the magical time frame of 48 hours.

And this guy waited over 48 hours without a resolution for the same issue I had:

forums.xbox.com/.../1866657.aspx

I hope he has had his lottery moment by now. I really do.

Hi again all. My achievements all unlocked last night, it was quite the show, almost like winning the achievement lottery A solid 5 minutes of achievement notifications. I can now view my achievement app and compare games with friends once again too and
no longer get the error code.

So what did I do to get it working again? Nothing, I just waited for Support to fix it like they said they would.

Live service alert shows that the affected platform is Xbox 360 only for the past four hours. Not seeing any live service alert for Xbox One at the moment. Even that, the update says it's for issues with Titanfall matchmaking, and apparently that has been
resolved. Live status still shows red but as I mentioned, no mention of anything being worked on for Xbox One's achievement issues.

I do not believe that any one is working to resolve the issues we're facing at the moment because there simply aren't enough people providing feedback about it.