All Hidden Parts in ACT 3
IA-C01W1: NEBULA Plasma Rifle
What mission? Underground Sabotage
Location: Reach the task where you need to destroy the old device in the center of the facility. Then fly through the massive cave and stay up to the left. You will eventually reach a platform illuminated by many spotlights. Destroy all enemies and fly higher onto the pipes until you see the box.
IA-C01G: AORTA Generator
What mission? Surveying an uninhabited floating city
Location: Follow the red beacons at the start of this mission and deactivate your first target. Now more beacons should appear, leading you to an elevated round platform. You will now be attacked by flying enemies that you must defeat.
Now check a nearby oval roof where a box is located. You will find the item there.
WB-0010: DOUBLE TROUBLE Chainsaw
What mission? Eliminate “Honest” Brute
Location: You can find the chainsaws when you fly down along the wreckage at the start of your mission. Stay to the left as you descend. At some point, you will find a platform that has many laser traps. On this platform, the box is located at the start of the wreck.
BC-0600: 12345 Booster
What mission? Eliminate “Honest” Brute
Location: You will find the booster after opening the first box. Continue descending until you find a large platform that looks like a train turnaround. Nearby is a tunnel you need to pass through.
Follow the path along, past an enemy, you will find the box on an elevated point at the end of the path.
WB-0000: BAD COOK Flamethrower
What mission? Eliminate “Honest” Brute
Location: After the second box, continue to follow your waypoint until you reach a round energy shield. Fight the enemies and keep to the right. You will find a narrow dark nook you can enter and drop down into.
In the air, try to avoid the laser traps and stay to the right. When you land, the box is in front of you in the new room.
Here are the hidden parts from Act 4