Re: bunion surgery good news!
I'm afraid I can't give you any input regarding the achiles tendon or this particular doctor. I've also never heard of the connection between the achiles tendon and bunions and no doc ever mentioned this to me. However, we're all different. As for being off your feet, this is just part of having bunion surgery. I was told the only weight bearing I could do for the first two weeks was to go to the bathroom or bathe (just what is necessary). My casts also helped protect my feet. I'm now at 3 weeks post-op and can do some walking (still casted) but not much before having pain. In general, I've learned that some docs recommend very limited weight bearing (or none at all) and some allow you to bear weight "as tolerated"---my first surgeon, the orthopod, had this approach.
My best advice is don't trust a surgeon just because he has a website or promises new or innovative techniques. Go with those docs who have been performing bunion procedures for a very long time (and very many) and whose techniques are proven and accepteds standard by podiatry or orthopedic experts. You can also ask your potential surgeon for references (his own patients) as well ask how many times he's performed the procedure and what his success rate is.
Best to be overly cautious before moving forward with any procedure. As someone whose had to do this bunion thing twice, I learned the hard way!
Best of luck.