Should i do calf raises to help recover from my achilles injury?

Yes helps Achilles: Stand on the edge of a step and lower the heels down slowly, both at the same time. Place the emphasis on the downward phase. Reverse the movement and rise up onto your tip toes. You can adjust the pressure on the injured leg by taking most of your weight on the good leg. Repeat this exercise as many times as is comfortable.Do not over-do it, apply cold therapy to Achilles after exercise.

Streching: Very controlled may be better.

It all depends on : What the actual injury was, how severe and whether or not the doctor wants you to start excercising yet - you really must check with the treating physician.