Not all parts in Armored Core VI: Fires of Rubicon are earned as rewards or unlocks. A dozen more can be discovered in the world by scanning for and opening Part Containers. This guide will list all of these Part Containers and which mission they can be found in.
Chapter 2 Mission 12: Infiltrate Grid 086
HC-3000 Wrecker Head
Enter the main building and descend into the hole. Eliminate the opposition and then scan around the rear area for the chest containing the Head.
CC-3000 Wrecker Core
Proceed from the previous location into the next area with the smelter. Descend once again into another opening and destroy the enemies here. Scan around again for the container with the Core part.
AC-3000 Wrecker Arms
Return to the smelter and observe the molten outpouring from one end. Enter the other empty opening to arrive at the next container with the Arms. The enemy here is a fair bit harder than the previous encounters so far.
2C-3000 Wrecker Legs
Carry on with the mission until the “Annihilate enemy MT squad” objective, whereupon you should go down the ramp instead and follow it to the lone enemy and the container holding the Legs.
Chapter 3 Mission 18: Tunnel Sabotage
IA-C01W1 Nebula Plasma Rifle
Enter the tunnel and proceed with the mission until Ayre’s comms mention the early return of PCA forces. Do not continue on the path, but instead bear left into the room with enemies and the laser firing away. The container with the Plasma Rifle is in the vicinity of the laser.
Chapter 3 Mission 19: Survey the Uninhabited Floating City
IA-C01G Aorta Generator
Shut down the first fog control device and proceed until attacked by a flier. Beat it and head for the cylindrical structure it came from to find the container on top with the Generator inside.
Chapter 3 Mission 24: Eliminate “Honest” Brute
WB-0010 Double Trouble Chainsaw
From the third waypoint where you learn about the red lasers, descend the platform to the lowest one and find the container with the Chainsaw.
BC-0600 12345 Booster
As you carry on from here, Brute will begin talking on the comms. Head in the exact opposite direction of the objective, scanning for a platform where the container with the Booster is located.
WB-0000 Bad Cook Flamethrower
Continue with the mission objectives until you arrive at the green forcefield. Enter it and proceed onward to the room with lasers where you will find the final container in this mission holding the Flamethrower.
Chapter 4 Mission 28: Underground Exploration – Depth 1
IA-C01L Ephemera Legs
Proceed through the mission until you begin descending the shaft. Roughly halfway through, the path will close forcing you towards the objective marker. In another room here, is the container with the Legs.
Chapter 4 Mission 29: Underground Exploration – Depth 2
IA-C01B Gills Booster
Eliminate the G5 Iguazu AC boss and continue your descent until you arrive at the blue laser firing at you. Pursue it through the door and find the container in a room to the right of where it escapes you, with the Booster inside.
IA-C01A Ephemera Arms
Leave the previous area and enter the ventilation shaft. Use the jump pad to reach the remaining container in this mission, to claim the Arms.
Chapter 4 Mission 33: Unknown Territory Survey
IA-C01H Ephemera Head
This one is not far off the beaten path, so just follow the objective through the tunnels, until you come across the container on your left, holding the Head.
Chapter 4 Mission 34: Reach the Coral Convergence
IA-C01W2 Moonlight Blade
Eliminate all ACs and MTs until you arrive at the gigantic ruined bridge. Cross it, defeat the enemy, and then descend to the left. Destroy these enemies as well and find the container nearby with the Blade.
Those are all the Part Containers that can be found in Armored Core 6.