Okay, I have been having trouble with 1 Autobot Unlockable. The Powered-Up Optimus Secondary weapon one. I use a fully charged canon and kill them but the unlock bar doesnt't go up. Here are some things I think I am doing wrong maybe.1:I use his primary weapon to lower their health first if they are a tough enemy, can I do that.2:The bar on the bottom is flashing and then I shoot, does it have to overheat too.3:I shoot the the enemy, does it have to shoot the ground.4:Air or ground, does it have to be on a certain terain. Like ground or air or can it be done on both. Finally 5:Does the level differ cause you can play as him on the last and second last level, do you have to do it on a certain one. If you could help me that would be great cause it's the only trophy I need left until PLATINUM 100% complete!!! !;)