Adding treehouse achievements to resume

You should just say that you know the skills that your achievements are referred to because your employer may not know about Treehouse. But you don't have to lie about what skills you know and what you don't.

At least for me personally, I'd consider adding a "Online Learning" category, with a "X courses completed" or "X hours of online learning" description. I probably wouldn't include the URL to my profile unless they asked for it, or list the exact courses or badges acquired unless I was going for a very specific job where that seemed useful. Unless I was going for an entry-level job, I'm not sure if an employer would care exactly where I learned my skills or what my Treehouse profile looked like. Being able to prove you know what you say you know via a portfolio of some kind is a lot more important. That said, I do think that most employers are looking for employees that are motivated self-starters, so I think that's the angle I would present it from.

If I was applying for a job I'd list Treehouse in the "other" category or as Ben Falk stated "Online Learning" category and then, when you get invited to the interview you can elaborate more on your Treehouse achievements and finished coursework and you can also say something along the lines of "...and I plan on expanding my knowledge even further considering that the coursework frequently updates and expends..."

Don't overfill your CV because most employers (especially the big companies) just skim through them for 15-30 seconds ( and don't have time to think what Treehouse is) or sometimes even use computers to generate a list of probable candidates who get invited to an interview based on the programed requirements of the position.

Hope this answer helps and you get the job.