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Not soloable

You channel it for 30 seconds, while the debuff lasts 30 seconds. However, multiple people channeling will reduce the needed channel time. For example, if 3 people go into the spirit world and click the artifact at the same time, you will activate it and get the achievement if those 3 channel for 10 seconds. 2 people have to channel for 15 seconds.

This achievement is easy to get during a wipe. We were wiping on Gara'jal tonight, and I called for 2 people to go in with me and channel. We got it easily before Gara'jal killed everyone.

Very easy achievement for a meta achievement. The real question is; does the activated artifact have any effect on the fight itself?

As of Patch 8.1, this achivement became soloable. You only need a class that has pets, Hunter or Warlock for example. We got it on first try, just:

1. Make the pet pull the boss, put it in Passive so it doesn't kill the boss
2. Wait for boss to put down a totem.
3. Go into the totem's radius, then break it, that will send you to the Spirit World.
4. In the spirit world, you have about 2-3 seconds to get to the center of the platform and grab the box, awarding you the achivement. If you don't make it, the encounter will reset and you can freely try again as much as you want.

Have fun!

There is video on YouTube about a guy doing it, in case my explaination was not clear enough.