The following features become available when you complete the corresponding task.

Unlock Big Head Mode:
Get an average team rating over 95% in Career mode.

Unlock Handball Challenge:
Score 30 or more in the 50 metre shootout.

Unlock International Cup:
Win the NAB AFL you/18's cup in competition mode.

Unlock Kick Knockout:
Score 4 or more in the Mark contest.

Unlock Mark Contest:
Score 30 or more in the Handball challenge.