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Lose Your Illusion (10 player)
Defeat Thorim while Sif is present in 10-player mode.
Lose Your Illusion (10 player) requires defeating Thorim while Sif is present, which is achieved by completing the gauntlet and engaging Thorim in under 3 minutes to trigger hard mode.
Clear the Arena Adds
Enter the encounter and kill all initial mobs in the arena as quickly as possible to prepare for opening the gate.
Pull the Lever
Open the lever to unlock the corridor gate — do this while Thorim is still in his dialogue to avoid interruption.
Run the Corridor
Sprint down the corridor and kill mobs as necessary; the entire gauntlet must be completed in under 3 minutes from the start of the encounter so that Sif remains present when Thorim is engaged.
Engage Thorim With Sif Present
Drop into the arena and engage Thorim before the 3-minute mark — this forces both Sif and Thorim to be fought simultaneously, which is the hard mode condition required for the achievement.
Manage Sif's Abilities
Sif cannot be killed but will cast Frostbolt Volley, Frost Nova, and Blizzard; avoid tanking Thorim on the outer edge of the arena since Sif's Blizzard always targets that area, and dispel Frost Nova from ranged before melee. Frost resistance gear reduces Sif's damage significantly.
Defeat Thorim
Kill Thorim while Sif is still alive and present to receive the Lose Your Illusion achievement; note that if the raid wipes during this phase, the Siffed achievement is still granted.
Tips
See the video guides linked above for visual walkthroughs of the gauntlet and boss phase.
Frost resistance gear from the Hodir encounter reduces damage from Sif's Frostbolt Volley, Frost Nova, and Blizzard noticeably.
Spread out during the Thorim fight to avoid chaining lightning damage through the melee group.