Objects in Transit May Shatter

Throughout the raid there are 4 items which must be clicked and brought to Neltharion's room. They can be dropped by using the extra action button and picked up freely.

You can see their locations in this screenshot and this one.
1- Expired Experiment is on the left behind some tanks (and a lot of trash) on the way to Amalgamation Chamber from Kazzara.
2 - Stack of Scrolls is on some boxes as you approach Zskarn from Rashok.
3 - Portable Ebon Anvil is on the ground as you approach Zskarn from Forgotten Experiments.
4 - Neverburning Ebon Candle is on the right behind some boxes as you enter the open terrace area near Assault of the Zaqali.

Edit 5/25/23: If you can't find the Stack of Scrolls where it's supposed to be but have the other 3 items, try resetting Echo of Neltharion. When this happened to us and a couple other groups that reported it, the Stack of Scrolls respawned in the boss room when the boss did.

None have any ill effects while being carried except for the Anvil which has a gradually stacking slow effect attached to it. The slow cannot be shifted out of by Druids. DKs can't be slowed below a certain percentage so we went with that. Might be able to Blessing of Freedom off the slow, but we never tried so I can't say for sure.

There are 3 mechanics that break rock walls in this fight.

[spell=401022] is cast on the tanks in P1 and P3.
[spell=407790] is cast on the tanks in P2.
[spell=407221] is cast on random non-tanks in all phases.

The P2 tank hit cannot be used for this achieve as it knocks your soul out and not your character. The other two are what you'll want to use.

While it's possible to have the items on the ground and then get them picked up by people who get picked for Rushing Darkness in time, they aren't always the most reactive to being clicked, with it sometimes taking 3-5 seconds for one to be picked up when I would spam click it. In addition to the randomness of who gets picked and the detriment of too many people trying and breaking a ton of walls, I would recommend you just let the tanks do the achieve.

How we did it was to have two of the items moved before the pull to one side of the room (right wall as you walk in). Then each of the tanks picked up one of the remaining two and we pulled the boss to the wall across from where we had placed the first two items (left wall as you walk in). The first tank strike broke the wall from the left side of the room to the entrance. We then placed a Fissure on the left and moved to the entrance. The second tank strike broke the walls from the entrance to the right side where our remaining two items were. Once there our tanks picked up the remaining two items and we pushed the boss to P2. Do P2 normally and then when in P3, use the tank strike to break another two walls in similar fashion.

The anvil slow makes it more annoying than the others, so we had that one destroyed first. I carried it as a Blood DK since we can't be slowed past a certain point. Besides that it makes no difference which tank carries what.

If you need help with the metas feel free to add me to Btag (NA only) or Discord!
Btag - FrostyShot#1667
Discord - yarini

So for this achievement you need to grab 4 items around the raid

Expired Experiment - After the first boss go left and there is a large vat on the left. Left of the vat there is a table and it is on the table.
Stack of Scrolls - After Rashok go up the chain and the scrolls are just on that landing against the wall (might need to reset the boss for them to appear)
Neverburning Ebon Candle - When you walk into the Defiant Rampart (place where Assault of the Zaqali is) take a right instead of going left to the boss. It is in the back of the room behind a cart.
"Portable" Ebon Anvil (has a 70% movement reduction) - After The Forgotten Experiments, go up the chain and the anvil is on the landing against the wall

If you wipe and destroyed a artifact, then the Items will spawn on the stairs at the front of the room.
When an artifact is destroyed it has a bleed that hurts.

all 4 of the items are around the raid pretty much once you have obtain them and you died on the boss fight they will respawn right next to the boss for people not having to run back around. :D