Trophy Description:As Tweed, use C4 to open door in Foundry.
Trophy Type:Bronze

This trophy can only be obtained on the third mission, "I Now Know Why You Cry." As the description says, it can only be done with the Demolitions Expert Tweed. The door to the Foundry is actually a secret locked room with weapons, supplies and even a Rocket Launcher (Rocket Launcher is also related to the DLC Pack 2.) To get it open though, you'll need to use the C4 you can find in the mission to blow it open. Once you get one, you can hold on to it and just use Nemesis to open the gates/sewers for you. The C4 can be found in the following locations:

1.Nemesis first location found by the ammo refill crate
2.Next to the crashed helicopter that Nemesis shot down in the park

During the course of the mission, you'll encounter Nemesis with his Rocket Launcher. From here, you'll have to use Nemesis to blow up the gates after you found and picked up one of the C4s. Continue using Nemesis to blow off the gates and enter the sewers. Once in the sewers, fight your way down the tunnels until you made it to the Foundry area. In the Foundry area, kill the zombies and go to the far end to find the "door in Foundry" that the trophy description wants Tweed to blow up. Plant the C4 on the gates if you still have it on you and you'll blow it open. The trophy will unlock while you're checking out the goodies in the room.