The main issue with a lot of the achilles issues that come about can be assisted with particular release and attention to the deeper 'plantar flexion' muscles, namely the Flexor Hallucis Longus  and the Flexor Digitorum Longus.  These two smaller muscles are deep to the larger power flexors of the ankle but as always, the small stuff is where the magic is at.  These two muscles act on the plantar flexion of the ankle (downward push of the toes and forefoot) and are very active in running and jumping.