Maybe you didn't get it because you nuked the independent people next to the capital, an edge case that wasn't considered.

Try again, but this time nuke the Main plaza city hex directly. You will need to declare surprise war. If this does not unlock it, it's most likely bugged.

The challenge of this achievement is having 20 war support to be able to declare war. (but you had 49)

Ansive wrote:

Maybe you didn't get it because you nuked the independent people next to the capital, an edge case that wasn't considered.

Try again, but this time nuke the Main plaza city hex directly. You will need to declare surprise war. If this does not unlock it, it's most likely bugged.

The challenge of this achievement is having 20 war support to be able to declare war. (but you had 49)

Thank you very much. It appears I was making life too difficult for myself.

I do have another issue now.

After unlocking the achievement and the closing my game and reopening my game the achievement is no longer unlocked.

Before:
https://www.xbox.com/play/media/3HD9CKJ9AT

After:
https://www.xbox.com/play/media/FGND3RZWN8

Same thing is happening to Landstalker, MVP and One Man Army. 

Hi, thank you for your report.

We are only partially able to reproduce these issues. Can you confirm on which platform you are playing, please?

Sorry for the inconvenience and thanks a lot in advance!

Cimiur wrote:

Hi, thank you for your report.

We are only partially able to reproduce these issues. Can you confirm on which platform you are playing, please?

Sorry for the inconvenience and thanks a lot in advance!

Hi Cimiur, 

Thanks for reaching out.

I am playing the Gamepass Version on PC. 

Hi,

We filed an issue for this bug.

Sorry again and thanks a lot for your help!

Cimiur wrote:

Hi,

We filed an issue for this bug.

Sorry again and thanks a lot for your help!

Hi,

Just want to find out if there has been any progress on finding a solution for this bug?