Maze MasterG 25

This is super tedious because you can only complete so many tasks in a day. Here is a detailed breakdown (credit to Shadow 00 Fox)

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.
Abyssal Siphoning: You gain 5% Life Steal Severity OR Abyssal Regeneration: You gain 400 Incoming Healing Bonus.

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.
Demonic Influence: You gain 400 Combat Advantage Bonus OR Demonic Resilience: Control effects will now have 5% shorter durations when applied to you.

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.
Demonic Endurance: Your Stamina regenerates 10% faster in Combat OR Demonic Swiftness: You now gain Action Points 3% faster

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!