Borderlands: The Pre-Sequel

To unlock this achievement you will need to complete a side mission called 'The Secret Chamber' that you will from Davis Pickle in Outlands Canyon. You can only acquire this mission after defeating 'Bosun' during the story mission 'Inteligences Of The Artificial Persuasion.'

You will need to find three echo devices to open the door to Zarpedon's secret chamber, revealing her chest. The first echo device (echo #3) you can find if you back track a little bit until you are in the security room. The just outside the security room underneath the front window some enemies will spawn out of a door. Kill them and one of them will drop the echo for you to pick up.

The second echo device (echo #2) can be found above the chamber that you are trying to enter. You reach this area by first jumping on to the top of the small container building next to the jump pad in front of the chamber door with the yellow tubes coming from it. From the roof of this building look up and back towards the way you came to see a ledge that you can boost jump up to. From this ledge you will need to jump onto the very thin wall (be careful) that separates the area where you are and the area where the chamber door is. From here you should be able to see a small area above the chamber door with some beds and consoles as well as the Echo. Jump to here and pick it up. A Lil' Badass Scav will spawn.

The third echo device (echo #1) Can be found across from the chamber. If you use the near-by jump pad to get across the chasm, the go into the elevator shaft and look up, on the side of the elevator above you can see a green glowing console. Shoot it. Then return to the jump pad and shoot the power box that it connected to it and use the jump pad, doing a boost jump as you reach the height of the jump to land on the upper most of the two ledges in front. From here look right and on the elevator you'll find the third and final echo device.

Return to the door and enter to unlock this achievement.

Huge thanks to Predni for the video:

To unlock this achievement you will need to complete a side mission called 'The Secret Chamber' that you will from Davis Pickle in Outlands Canyon. You can only acquire this mission after defeating 'Bosun' during the story mission 'Inteligences Of The Artificial Persuasion'.

You will need to find 3 Echo devices to open the door to Zarpedon's secret chamber, revealing her chest. The first Echo device (Echo #3) you can find if you back track a little bit until you are in the security room. The just outside the security room underneath the front window some enemies will spawn out of a door. Kill them and one of them will drop the Echo for you to pick up.

The second Echo device (Echo #2) can be found above the Chamber that you are trying to enter. You reach this area by first jumping on to the top of the small container building next to the jump pad in front of the chamber door with the yellow tubes coming from it. From the roof of this building look up and back towards the way you came to see a ledge that you can boost jump up to. From this ledge you will need to jump onto the very thin wall (be careful) that separates the area where you are and the area where the Chamber door is. From here you should be able to see a small area above the Chamber door with some beds and consoles as well as the Echo. Jump to here and pick it up. A Lil' Badass Scav will spawn.

The third Echo device (Echo #1) Can be found across from the Chamber. If you use the near-by jump pad to get across the chasm, the go into the elevator shaft and look up, on the side of the elevator above you can see a green glowing console. Shoot it. Then return to the jump pad and shoot the power box that it connected to it and use the jump pad, doing a boost jump as you reach the height of the jump to land on the upper most of the 2 ledges in front. From here look right and on the elevator you'll find the third and final Echo device.

Return to the door and enter to unlock this achievement.

Huge thanks to 'Predni' for the video: