Snake Eyes

Although the orb mechanic has changed, I was still able to solo this achievement. You no longer need to carry the orbs to the eyes, you just click on the orbs and complete a channel. You channel 3% at a time so you can channel one orb to 99% (I stopped at 96% just to be safe), go to the other orb and complete the channel, then run back to the first orb and complete the channel. I did it on a Druid just using Dash. The achievement wont complete until the skull opens up, so don't worry if you see the second eye activate but don't immediately get the achievement.

Easy Solo Achievement for Level 70 Dragonflight & Beyond...

1) Mythic Difficulty.

2) Clear trash between both orbs leading up to the large eye skull

3) Grab orb on right side, fire it near the flame pillar before the large eye skull, but not past. What you DON'T want to do is launch the orb too close to the skull or it'll socket it from a distance.

4) Grab orb on the left side, fire it near the pillars before the large eye skull, but not past. Refine the orbs so they are just a few feet from each other. If adds pick up the orbs, just quickly take them out.

4b) If something goes wrong and you launched an orb too close to the skull and it already socketed, but the other orb is not yet in socketed, exit the dungeon and wait 31 minutes for the soft-reset, re-enter instance and try again.

5) Now with both orbs relatively side by side grab one and throw it at the foot of the skull, quickly and within ten seconds throw the other orb at the foot of the skull.

6) The skull begins to open, revealing the pathway, run through the skull.

7) ?

8) Boom. Profit. Achievement Completed.

For this achievement you will want to use class utility abilities to crowd control the [npc=135007] while you get both eyes closer. Note that there are several [npc=135007] throughout the room that will attempt to steal your eye back, there is one near each eye, one in between the eyes and the skull, and a few more in the middle of the room.

Abilities such as [spell=115078], Freezing Trap and Polymorph are ideal, as you can cc the guardians on one side and then ignore them completely.

If you need help with the other achievements, check this TLDR guide for all achievements: [guide=6418]