I would not ask for that information. Admissions will not give out their private, internal notes on your file. IMO even asking will make you look really bad. You are in - be happy-- case closed. Don’t give anyone any reason to re-visit your file.
There is no magic formula for admission to the top tier schools and unless you won a Nobel Prize or something there is likely no one reason that you were accepted. You can safely assume that the school was impressed by your entire package including academic stats, essays, ECs, and recommendations.