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You can get the achievement by becoming a helper of the game and receiving a special paint.

What actually "becoming a helper of the game" means?
How to become helper of the game?

A potential candidate for moderator needs to be able to perform simple task such as searching for and filling out the application form, without anyone's help.
Customer support service by UserEcho
You can get the achievement by becoming a helper of the game and receiving a special paint.