What is a correct way for "marketing" non core PhD achievements on a CV?
I see no reason at all to leave any reasonable skill or ability off of your CV. Play a musical instrument? Won some medals in a sporting event? Program an android app? Have a black belt in a martial art? Add a section called "Other skills" or "Personal Information" and briefly list these skills. There are two reasons for this. First, it can help a potential employer think of you as a real person, perhaps someone they would like to know. Second, many skills can take years of dedicated practice to master; if you can master one such skill, then there is a good chance you can master whatever new skills may be required in the new job. 

Here is an example from my life. Many years ago I programmed a video game (one of the old "text adventure" style games. I placed this on my CV, not thinking much about it. It turned out that one of the elder faculty conducting the interview had played that game and remembered it fondly. This alone certainly did not "get me the job," but anything that can smooth the way can be helpful.