Decorated Veterans Trophy

This can be obtained online with a friend, or offline with two controllers. A quick and easy way to do this is to wait until you reach Stark Tower 2. Press Start on the second controller to activate co-op and enter the Simulator. In the Replay Menu, select Stark Tower 1. Once it loads up, run to the 'Next Mission console in the middle of the room and you will be returned to the Replay Menu. Repeat this process 23 more times for your trophy!

NOTE: There is a possible bug with this method wherein on leaving STARK 1 you end up having to play through the NY stages again. A good idea is to save on two separate files back and forth, if one messes up, load the other to avoid replaying these missions. More information can be found here.