The Hand of Gaia is one of the four new wonder weapons on the map Ancient Evil. As is the case with many of the Zombie achievements in this game, this can be completed on Casual difficulty, so I would highly recommend using it over the other difficulties if you're going for this.
To begin, you'll need to find one of the four Dormant Hands
found scattered throughout the map. There are 20 spawn locations for them, all of which can be found in this video:
Alternatively, if you would like pictures of their locations, this Reddit link will also show all 20.
After you've found your first Dormant Hand, head to the Spartan Monument
location of the map and look for the glowing green circle on the ground. Deposit your Dormant Hand into the statue and you'll begin a little ritual. It will require you to kill roughly 10 zombies that are glowing green in the chest, all the while you are required to stay within the glowing circle. After all 10 have been killed, you will be able to pick up the Hand of Gaia.
We're halfway there!
This weapon will need to be upgraded in order to use the charged ability required to unlock this achievement. In order to upgrade to the Redeemed Hand of Gaia
, you'll need to locate three plants with Red Crystals on them. Their locations are in the Temple Terrace
, the Stoa of the Athenians
, and the Intersection of Treasuries.
When you find these three tress, shoot each of the crystals using the Hand of Gaia and a seedling will spawn on the ground in front of the tree. Hold
on these seedlings and carry them back to the ritual statue we deposited the Dormant Hand at initially. When you've successfully carried all three of them back to the statue, a portal will spawn that you need to enter.
This part is pretty straight forward, and is more or less a tutorial teaching you how to use the charged ability of the Redeemed version of the gauntlet. After killing the 30ish Zombies that spawn in, another portal will appear allowing you to exit with your newly upgraded Hand.
With the hard part out of the way, you now need to kill 8 zombies with one charged shot. This can easily be obtained anywhere you desire, but I find the easiest place to horde Zombies is in the Amphitheater.
Simply horde up 15-20 zombies, hold down
, and when you kill 8 in one go, the achievement will pop! This achievement was a little trickier than the other gauntlets, but I found it easiest to try and line the zombies up (as best you can) and try launching the charged shot at them that way, instead of shooting the while their in a circle.
If any of my steps were confusing to you, or if you just want a visual aid, be sure to check out this super quick (less than 2:00) video of a YouTuber named Glitch on how to build and upgrade the Hand of Gaia.