The question has been asked for a while! Here the answer.
You just hace to complete de currĂculum questions AND the 5 projects. I want to know if i can with only the projects
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nhcarriganwhile (coffee) return code
You do not need to complete the lessons to obtain the certificate - you only need to complete the 5 certification projects. 
My point of view:
The courses are for people with a few knowledge and have to learn everything from the beginning.
If you have enough knowledge jump the courses and get certified.