It is currently impossible to add new conditions to the badges, so you have to choose one from existing requirements.
Existing conditions
・Times that you add cards to “Favourites”
・Times that you write posts
・Times that you comment on cards
・Times that you "like" others’ posts
・Points that you earn
・Number of badges that you acquire
・Number of courses that you finish
・Number of chapters that you finish
・Number of sections that you finish
・Number of cards that you finish
・Times that you log in
・Total hours of using the app
・Whether you have finished a specific course or not
・Whether you have finished a specific chapter or not
・Whether you have finished a specific section or not
・Number of days that you are not logging in
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