Simply replace the unfilled areas such as "[]" and "[date]" with your information.
Dear [name],
You have proven the skeptics wrong and accomplished what most said was impossible.
There is no doubt that your recent achievements will be spoken of for some time and that the admiration for your accomplishments is felt by all of us within the industry as well as the general public.
Please accept my heartiest congratulations for your success.
Sincerely,