Asana has long had a nice feature for exporting Projects to CSV. However, what if you want to export and view all contents in a single Task? This feature does not exist, however I use a helpful work around to accomplish this.
From the Task menu, select more actions:
Select Print …
From the Print Dialog, instead of sending the document to a printer, select Save as PDF as the Destination.
This will save the entire task to PDF format. The formatting is not as palatable as it could be, but it will display all Comments, Subtasks, Comments on Subtasks, etc., which is a nice to have for larger Tasks.