An ACT composite of 28 is still in the bottom 25%ile of Georgia tech applicants(25 - 75 %ile ACT range is 30 - 33), so it is still a reach for you, but good luck, you seem to have some other match/safety schools on your list! Link for GATech freshman profile: http://admission.gatech.edu/images/pdf/2015_freshman_profile_web.pdf