First introduced in 2013, the awarding of "ACC Letters" is the highest individual accolade awarded by the ACC. To receive "Letters", a student must be selected in an All Star team in the same sport for the prescribed minimum number of years. The number of years does not have to be consecutive, but the years are not cumulative across sports.
- Letters in Honorary sports can only be achieved by All Star selection in the same sport for at least 4 years.
- Letters in Representative sports can only be achieved by All Star selection in the same sport for at least 3 years.
- Letters can be achieved in multiple sports as long as the student meets the qualification criteria of four or three year selections in each sport.
- Letters are awarded for honorary selection in the three major carnival sports of Athletics, Cross Country and Swimming.
- Letters are awarded for representative selection in Basketball, Cricket and Netball.
- Letters awards in athletics, cross country and swimming commenced in 2013. Basketball, cricket and netball commenced in 2018. The starting qualification period dating back to 2009.
- Only students currently enrolled in an ACC school are eligible to receive Letters.
- Students that graduated before 2013 are not eligible to receive letters in Athletics, Swimming and Cross Country.
- Students that graduated before 2018 are not eligible to receive letters in Basketball, Cricket and Netball.
- Students that are awarded letters will be presented with a framed "ACC Letter" as a memento of their outstanding achievement and will also become members of the exclusive ACC