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It will take a minimum of 28 days to complete the Maze Engine Campaign!
Actually popping this particular achievement is easy.. getting to where you can pop it is the nasty long part.

This is the 2nd last item on the Maze Engine Campaign screen in game, top left of the campaign window. Activating will allow you to choose the last boon for the Maze Engine Campaign as well and unlock the final repeatable task, "Defend the Sword Coast".

Getting there is a long story, and here's how it goes:
Note: in general you will have to talk to Bruenor between every single task, even little ones!

Days 1-5:
1. You must first be at least level 60 and accept the start of the Maze Engine from Bruenor Battlehammer in Mantol-Derith.
2. Complete chapters 1, 2, and 3 of the Maze Engine Campaign then open the Campaign window and activate Aid Bruenor Battlehammer. You will receive XP and Dwarven Battlerager
3. Complete 5 daily tasks "Repel Demons" given by Bruenor, the first of which you can accept and complete immediately after Step 2. After the 5th daily task is complete, open the Campaign window and activate Repel Demons to get your 1st boon.

Days 5-14:
4. Complete Chapters 4 and 5, then open the Campaign window and activate Locate Vizeran DeVir. You will receive XP and Replica Battlerager Armor
5. Complete 10 daily tasks "Defend Neverwinter" given by Bruenor like before. After 10th daily task is complete, open the Campaign window and activate Defend Neverwinter to get your 2nd boon.

Days 14-28:
6. Complete Chapters 6, 7, 8, 9, and 10, then open the Campaign window and activate Gather Components. You will receive XP and Mount Insignia Choice Pack
7. Complete 15 daily tasks "Assault Demons" given by Bruenor. After 15th daily task is completed, open the Campaign window and activate Assault Demons to get your 3rd boon.
8. Complete Chapters 11, 12, and Epilogue, then open the Campaign window and activate Destroy the Maze Engine to get your achievement and 4th boon!

At this point, you've completed the achievement, but can do the final repeatable task for more XP and Gauntlgrym Bounty which has: