I think it is rare that any NBA player fully recovers from any ACL tear, and certainly not from an Achilles tear. Unfortunately for Parker he is so young that Milwaukee never would have traded him for simply having that history, but in reality that would have been the smart play. It is the main reason why Danny let Tony Allen walk, and traded Perkins and Rondo.
For all you Embiid psychos out there...be VERY careful.