Like others urging caution, I'd say build up very gradually and stay away from hills for a few weeks.
Way back, I was a club runner, racing almost every week at all distances from 5k to marathon, running sub six-minute miles regularly, even in half-marathons. I last ran seriously in 2005 and started commuting by bike shortly after and got the cycling bug. Last year I decided I'd like to try the local park run and went for a very easy jog of about a mile. My right achilles was still sore two weeks later. I think the biggest mistake was that the run had a couple of short, but fairly steep hills and this is where the damage was done. I'm sticking to cycling now, with regular golf for cross training.
Way back, I was a club runner, racing almost every week at all distances from 5k to marathon, running sub six-minute miles regularly, even in half-marathons. I last ran seriously in 2005 and started commuting by bike shortly after and got the cycling bug. Last year I decided I'd like to try the local park run and went for a very easy jog of about a mile. My right achilles was still sore two weeks later. I think the biggest mistake was that the run had a couple of short, but fairly steep hills and this is where the damage was done. I'm sticking to cycling now, with regular golf for cross training.