This is what I found in CIC website..
"The ECA report must show that your completed foreign credential (degree, diploma or certificate) is equal to a completed Canadian secondary school (high school) or post-secondary credential.
You must submit an ECA for all levels of completed foreign education you want us to consider. It is up to you to decide which credentials to have assessed by a designated organization.
Depending on your case, you may want to have both your secondary and post-secondary credentials assessed, and not just your highest completed foreign credential. You will not get any points for your foreign education under the CRS in Express Entry or be eligible under the FSWP if the result on your ECA report does not match at least one of the results in the conversion table."
I think you should get assessment done for your Degree/Diploma and Masters. You can get you educational qualifications assessed by WES. If you check the website of WES they do provide the list of documents you need to send them for the same. Its mainly the certificates and transcript from the university directly to WES or through you in a sealed envelope.