If someone managed to rid themselves of absolutely all illusions, they would cease to exist.
And because time is an illusion, too, they would cease to have ever existed. So unless you rid yourself of all illusions, too, you could never know whether someone else ever accomplished that. But if you do accomplish that, you'll realize that the whole idea and pursuit was bullshit to begin with. So then, fully enlightened, you eventually decide to go back to existing, and the concept of ridding yourself of all illusions ceases to exist.
Meditate on this.
Keep a bucket close-by.