Can i change GamiPress badges, quests, ranks names or create new ones?

1) Renaming existing achievement and rank types:

You can change / translate the names throughout the site but it's very important that you don't change the information (name, slug, etc) that is assigned to them in the GamiPress -> "Achievement Types" and "Rank Types" backend pages as this information is used to display them on several pages and widgets throughout the site.

Changing this information will cause several theme widgets and pages to not display information about the corresponding badges, quests or ranks.

If you want to rename the URL of the pages, you have to rename the slug of the respective WordPress Page that is used to display them (if you are using the theme demo import, the pages will be named "Badges", "Quests" and "Ranks" and have the "Badges Page", "Quests Page" and "Ranks Page" Template assigned to them).

All other mentions of the Badges, Quests and Ranks in the theme can be renamed by translating the theme.

2) Creating new achievement and rank types: 

You can create new achievement and rank types but the theme won't recognize them so they won't be displayed or used anywhere on the site.

Check the documentation "GamiPress" section for more information on how this works and for video tutorials on how to create each achievement type, rank type and point type.