Hello,
I am a bit confused about what is your issue. You are mentioning Core Shields, that are part of Avast Security product. You also mention VPN and Declutter (I suppose its Cleanup), and these don't have CoreShields.
Avast Security product is tested and should work natively on M1 chips. The latest version of Avast Security is 14.8 and you should have macOS on version 11.2. The first version that supported M1 fully was Avast Security 14.7. If you have any older version it will not work.
Avast Cleanup also has a native support for M1 chips. This SW does not have any extensions so should not have any issues with them.
Avast Secureline VPN requires Rosetta to run at this point.
Please try to install latest version from our web pages. If the issue persist, please open Avast Security menu, there is Help -> Technical Support -> Support Package. This will collect logs from the product that should help me investigate the issue. If you fill in your e-mail we can continue investigating the issue this way.
Best regards,
Jakub