How to change language of achievements in Google Play Games

I have an issue with achievements in Google Play Games. I've noticed this when playing Clash of Clans (but it's not limited to it. Every game that has Russian translation of achievements is affected). I used to use Russian language in the game and my Google account. Now my Google account and system language is set to Ukrainian, and the language of the game is set to English. Google Play country is set to Ukraine. However, Play Games continues to show achievements in Russian. I can't find how to change it. I've already asked for the help from the community, but got no answer after more than a week: https://support.google.com/googleplay/thread/251211195