I've heard really positive things about dry needling generally, although I haven't looked into it for Achilles tendonitis in particular. My dad uses it on his patients and gets it done himself so you can pick his brain in Presque Isle.
I had loads done for my hip, knee and some other troubles. Most often it helped a lot, just not for the hip because the problem was elsewhere and I was compensating.
I had it for my ab/hip issues. It was good for relieving symptoms, but not for getting at the root problem that was causing it in the first place. But getting things to settle down allowed my PT to work on identifying the underlying cause, so that was a good thing.
I had it done once on some knots in my calf when I was having Achilles issues. I couldn't say whether it ultimately helped or not, but it didn't cause any problems beyond initial soreness.
So far, so good. Haven't yet punctured a lung. Thanks for your input, guys.
My experience is very similar to Tori's - helps symptoms, not underlying problems.
I am happy that needles in your achilles did not puncture your lung.
I don't want to think how long those needles would be!