Start a TranZit game by going to Zombies > Green Run > Bus Depot > TranZit
In order to build items simply find each of its parts and hold x to pick the part up.
Take the part to the building table (the table with a red toolbox and blueprints) and hold x on the table to add the part to the item.
ITEM 1 - Turbine - SPAWN ROOMBuilding table is in the spawn room.
Part1 - TAIL-FIN - found on the ground below the telephone on the wall
Part2 - MANNEQUIN - random spawn (in the spawn room usually near the map)
Part3 - FAN - on the chair near the building table
ITEM 2 - Zombie shield - DINER BUS STOPBuilding table is in the car jack building.
Part1 - TROLLEY - found in the diner
Part2 - CAR DOOR - found in the same building as the building table
ITEM 3 - Turret - FARM BUS STOPBuilding table is on the bottom floor of the farm house.
Part1 - MOWER - random spawn (somewhere on the farm)
Part2 - RPK - random spawn (somewhere on the farm)
Part3 - AMMO - random spawn (somewhere on the farm)
ITEM 4 - Electric trap - POWER ROOM BUS STOPOpen the door near the AK74, build the power switch.
The parts can be found in the power room; a switch, a switchboard & a zombie arm.
The building table is near the power switch.
Turn the power on and wait for the roller door to open.
Alternatively, use your turbine (item1) to open the roller door.Building table is in the gravestone perk room.
Part1 - BATTERY - random spawn (usually on the catwalk gravestone room)
Part2 - METAL BALL & ROD CONDUCTOR - (usually on a box, same room)
Part3 - LIGHT - random (usually in a window, same room)
Each item does not have to be used however it must be equipped and appear in your dpad menu (bottom right of screen) in order for it to count. Once you have built all four items and equipped each at least once the achievement will pop.
Happy hunting
coreymawf
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All credit for this youtube video demo goes to RoosterTeeth.