so according to cough...steam... cough, there is a hotfix out that should fix the achievement issue for us. any idea how long we will need to wait until it filters down to us?

"HOTFIX 1.0
Today, we're deploying our first hotfix that addresses some of the gameplay issues reported lately:

Removed access to the debug menu when activating the cheat codes in the options.
The 'palace' tooltip no longer breaks the other tooltips
The 'population' tooltip no longer closes every time a day passes.
Achievements now properly unlock in the GOG version.
“Blessing of the Gods” achievement now doesn’t unlock by simply pressing the “A” key.
Fixed a few localization keys that didn’t display the proper text.
Fixed Gatehouses sorting.

We'd like to thank you all for playing and sharing your first thoughts about Pharaoh: A New Era. Feel free to share them using the "Feedback & Suggestion" subforum on Steam. We're doing our best to gather everything and study them carefully.

Thank you for your understanding!"

I already earned some achievements. Not sure how "properly" they were..
According to GogDB, it has not yet been added to the game. Hope for beginning of the week.

Recently GOG Galaxy updated the game (8 MB) , but the patch notes are not published.