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Pretty easy solo at Level 70 Dragonflight & Level 80 WorldSoul Saga & Beyond...

1. Begin Fight

2. Trapezoids at opposite ends of each of the 3 rooms are now clickable. You must find 3 trapezoids that go dark.

3. Click one, if it blinks, move to the next room and click another, rinse & repeat.

4. Eventually you'll get a trapezoid that just goes dark, awesome. Now find two more in the other two rooms that also go dark.

5. Once three separate trapezoids have gone dark, defeat boss.

6. ?

7. Profit. Achievement Completed.

When you start the fight the blue trapezoids where the vents are that does [spell=267795] will be clickable.
You only need to click on 1 of the trapezoid in each room to enter the code.

When you click on a trapezoid it will either blink or turn dark. The code is completely random but you have as many attempts as you want to guess it.
If the trapezoid blinks, it means you have entered the wrong sequence and need to start over. if it turns dark it means you have entered the right sequence.

When all 3 trapezoid in the room turns dark it means you can safely kill the boss to get the achievement.

To enter the "passcode" you will have to click the buttons in each chamber in a specific order that is randomized for every group. The order can be 321, 213, 231 or similar combinations.

Check if the buttons in the first room stop blinking, and then send a group of 2-3 dps and a healer to click on the buttons in the second and the third room. If the buttons are clicked in the right sequence, they will stop blinking and won't be clickable anymore. Once you've done that you can kill the boss and get the achievement.