I don't know of any ways to get college credits outside of college. At least not in the USA.

One of my past jobs was at a university evaluating transcripts of students who were transferring in. I had to look up all of the courses on the transcripts of their previous colleges and universities to determine if the college I worked for would accept the classes and, if so, what classes they would be considered equivalent to.

At no time did this university accept "life experiences" as college credit. Only classes from accredited colleges and universities could be accepted.