I don't think there are many, if any, Ts that can"fix" attachment issues. By nature you're only diagnosed with attachment disorders as a child. At that stage things can change with a proper home environment and perhaps therapy.

As an adult you'll have developed an attachment style and in some cases an unresolved attachment disorder may morph into a personality disorder. Many Ts can treat these issues but I doubt any can really fix them. What they can do is help you identify the possible root causes and then work on what you can do now to improve your relationships and quality of life. That's been my take on it anyway.