In the last 2 years I've been getting an injury on my Achilles tendon from running, cause and treatment?

Several things: Chronic fatigue of the tendon, tendinitis - one needs to pre-stretch prior to running, drink plenty of fluids and see your foot doctor specializing in the sports medicine to assess for the proper foot function and alignment.
See below. You need to see a physical therapist who can get you into a proper stretching routine. You also need a proper orthotic to control your foot motion.