Unfortunately the only thing you can do for a sore Achilles is rest. I have been off running for over 2 months now because of a sore left one! I tried a couple of experimental runs after 2 weeks (disaster - limping again) and I think I did more harm than good so then I left it another 4 weeks. I then did 0.75 miles with my 7 yo DD (so I knew I wouldn't go too fast) 2 weeks ago and then a 3.5 mile run the next day. It felt a little stiff while running but after a mile it was absolutely fine. I didn't want to do too much too soon (which is the killer for Achilles injuries) so I left it until this weekend and did 1.5 miles with my DD again (she did so well bless her!) and 2.5 on my own the day after. After each session I did loads of stretching of my quads/calves/hamstrings which has helped. And it was ok, no pain this morning and no stiffness. So I think I can start easing back into it.
I've been doing Jillian's Ri30 and was on week 2 last week and that has been causing some aches in the same area (apart from the severe pain in all of my muscles because of the exercises ) and I think it is the mountain climber exercises that are to blame so I adapted the exercise to make sure I'm not hyper-extending the tendon.
What I'm saying is that you need to rest it, properly, because if you go back too soon you will be off for even longer. I have been exercising throughout but absolutely no running. If you can get the area warmed up and then rub the area (you need to break down the scar tissue and get the blood flowing through the area to heal it - Achilles have notoriously poor blood flow hence they take so long to heal) as well as lots of gentle stretching.
That's just my experience btw and I'm not qualified in anything medical or physiological in any shape or form so feel free to ignore my entire post .
Now I've just got to sort out the pins and needles in my foot when I run, the knot in the quad in the same leg, and the tight bum-cheek and I'm sorted...!