Is your feature request related to a problem? Please describe.
The current GZ feature lacks customization, allowing only to choose a list of 15-18 predefined congratulations or a single custom reply.

Describe the solution you'd like
Add an option to list any number of GZ, with the option to show them if you have/don't have the achievement or any.

Additional context
I have added ~90 new lines myself in Achievements.lua but they are always overwritten with new addon updates and it is frustrating to write them again every update (luckily I had a backup, so it is just annoying). If anyone wants, I can post my list of congratulations.