Black Ops II - Dead Man's Party Bus Achievement

In TranZit, complete all additions to the bus in 1 game

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There are a total of four different additions to the bus on TranZit.

Here is where you will find them:

Bus Depot
From the starting room build the fan and open the white door that says you need power. The part will be to your right.
Diner
From where you get off the bus, go left to the shack. Use the fan and there should be a piece in that room.
Farm
First open the gate for 750 points. Then continue forward and there will be a door you need to use the fan on straight in front of you. Piece will be on the floor.
Town
When you get off the bus you head to the left and down the street. Weave through the cars and there will be a door on the right. Once again use the fan on the door and the piece will be inside.