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Helheim Hath No Fury
Rescue the Captured Val'kyr in Maw of Souls on Mythic difficulty.
Helheim Hath No Fury requires you to rescue the Captured Val'kyr by defeating Harbaron, the second boss in Maw of Souls, on Mythic difficulty before she dies.
Enter Maw of Souls
Enter Maw of Souls on Mythic difficulty and defeat the first boss. After the first boss dies, click the horn behind him to proceed to the next section of the dungeon.
Start Your Timer
Once inside the ship, watch for the emote in chat: 'Harbaron begins to drain the soul of the Captured Val'kyr.' At this point you have 3 minutes and 30 seconds to reach and kill Harbaron. Use /stopwatch 0:3:30 to track the time.
Navigate Past Ship Enemies
Pull the first two monsters in front of you and the two monsters on the left side. Wait for the patrolling monster to walk back toward the stairs before proceeding, as he can see players who are invisible. Use a 
Draenic Invisibility Potion (18 seconds of invisibility) to bypass remaining enemies and reach Harbaron quickly.
Kill Harbaron Before Val'kyr Dies
Defeat Harbaron before the Captured Val'kyr's health reaches zero to complete the achievement. The Val'kyr continues losing health even after the boss is pulled, so kill him as fast as possible.
Tips
If someone in your group already has this achievement, they cannot be the one to pull Harbaron — the achievement will only trigger for players who do not yet have it, and only if one of those players pulls the boss.
See the video guide for a full walkthrough of the route through the ship: https://youtu.be/EOIeu1cbcvw