I can't choose certain attribute because it is not presented in the list

For the fields which are required for Amazon, the only common attributes, those which are presented in all attribute sets are shown in the dropdown.

If you do not see certain attribute, please ensure that it is added to  every attribute sets (Catalog -> Attributes -> Manage Attribute Sets in Magento v1.x and Stores > Attributes > Attribute Sets in Magento v 2.x)