My GOGG is not updating achieviements . someone else ?

Have you tried playing a game that GOG actually sells?

OK you probably mean Galaxy, and I think this has been a problem with actual GOG games too. I don't trust Galaxy due to the backdoor fiasco, so I say just delete the blasted thing and rely on offline installers and Steam.

If you've already tried the cogwheel in the top left - Sync Integrations, then try asking your question on the GOG Galaxy forum. And be sure to mention what integration (store/platform) you're using.