I was diagnosed with acid reflux for over a decade and now i have achalasia type 3.could acid reflux have caused it?

It certainly could: have contributed. Although there is no specific known cause for this problem it would not be surprising if we eventually identified a causative factor related to chronic reflux and associated inflammatory response.

Not likely.: Achalasia is a disease of the nerves of the esophagus, which would be unlikely to be affected by reflux in the lumen of the esophagus. It would be interesting to verify the results of your manometry. This is an unusual turn of events. You might consider verifying it with a second opinion from a different gastroenterologist, particularly before any achalasia procedure is planned. Good luck.