Otto provides a list where all attributes by category group and category can be filtered. The list can be downloaded here:  

https://docs.google.com/spreadsheets/d/1Yv-Uw7d8JG6fwNaKPq3KMutWXINhL_G3YO6v5Upm7QM/edit?usp=sharing

Please filter the list according to your specific requirements by using the filter function of google sheets in the right upper corner. 

Then filter by category group and Feature Relevance. All fields with Feature Relevance "LEGAL, PRODUCT_DETAILS" have to be filled out at least. 

E.g. for category group "Mützen" it is just "Materialzusammensetzung". 

However, we advice to fill out also fields with Attribute Relevance "HIGH". This may improve search results and rankings. 

Next Step: Set up the Product Template in Hello Pine to start fill out fields in the app