After looking up the dictionary and searching keywords on Google I failed to find the exact thing I want to express. I made this sentence up. I am not sure if I can use the phrase "with achievement of" in this manner. Google hits do not appear to be relevant to my context.
I asked on WordReference and some people there suggest I use "having obtained my degree" or "after obtaining my degree". But I still wonder if it sounds natural with the usage of "achievement" in a sentence introducing my academic background in an internship cover letter?
I am a student studying my master's degree in Major A at University A, with the achievement of a bachelor's degree in Major B at University B?