Snowborn Challenges are unique guild achievements that you can earn. Each completed challenge will give you points that add up to your overall progress in the guild. Challenges are divided into multiple categories. The Master Document includes sheet for Overall progress and then one sheet for each category. You can easily view your progress in each category in Overall sheet, or progress and specific achievements in category sheets. You cannot write in the Master Document, but you can add comments, so whenever you think that an achievement that you have earned has not been unlocked in the Master Sheet, just add a comment to that particular cell.
To sign up, just add a comment in here with your name/nickname along with your actual PSN ID.