The first isn't used and the second is. However, you can talk about a "Bachelor of XXX [Arts, Science ...] degree", or simply a BA or a BSc or whatever.
In the US it's always plural. We would never say "I completed a Bachelor degree"
May 14, 2016
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You can say both in my experience.
I completed a bachelor degree before I started my graduate certificate course.
My bachelor's degree was useful for finding a job.
Useage may depend on the English speaking country you are in and the qualifications framework applicable in that country.
May 14, 2016
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