How to get all the data of a model from backbone?

Hi, I'm trying to get the data of a model (Account) to send it to a third party service from Backbone, but I can't seem to find a way to get all the attributes of the model. I'm only receiving the attributes that are loaded in the view

I've tried using the sync method to get all the attributes with its respective values but that doesn't seem to work either 

I'm on  SugarCRM Professional, Version 8.1.0 (Build 135) (Summer '18)