Unlock Optimus and Megatron Skins Complete the following tasks to unlock the corresponding Optimus and Megatron skins.
Unlock G1 Optimus Prime: Collect ALL the Autobot symbols.
Unlock G1 Megatron: Collect ALL the Decepticon symbols.
Unlock RoboVison Optimus Prime: Complete the Autobot campaign.
Defeating the Cement Truck Decepticon: When you are Ironhide and fighting the Cement Truck Decepticon you can defeat him by transforming and running him over to knock him down and then picking him up and throwing him.