Gears 5

easier method than the OP is this, go on the map gauntlet on beginner with 2 other friends (no need for higher difficulty) get to the end and make sure you have a rocket salvo with 20 bullets. get a rocket salvo from one of the salvo scions that spawn in the map. if you don't have 20 bullets then use one of the weapon lockers to recharge your ammo.

when everyone has their ultimate ready have the person with the salvo stand on the ramp just outside the exit door and look at the little side room (this is where all the enemies will spawn). have someone pull the lever start the door closing and then everyone pop their ultimates.

go ham with the salvo and achievement will unlock. simple as that.

Also would just like too add that anybody panicking that once the gauntlet has expired they will not be able to do this method don't worry. you can go host a private game and select gauntlet from there once it goes from the public matchmaking.

EDIT: you can also use the Breaker Mace from the warden just before the end aswell to get the achievement. also only one person do it per run to ensure that they get 9000 damage then rinse and repeat for the other 2 players.

please if voting negative comment why so i can improve the solution.

Hello!
I have a guaranteed method for this seemingly tricky achievment.
Start by having 2 other players your chatting with, as you need communication for when you all pop your ultimate.

Next up, out of the 3 chooseable characters Lahni is your best friend. As she is all melee and that is exactly how you are going to get this 9k damage needed. Make sure to have the brawler card as high level as you can, mine was only 50% Gives extra melee damage.

Edit: Thanks to Mattyl22l and mi2good4u, they pointed out you can do this on intermediate difficulty. Not only That, All players can get this in 1 run. Simply get 1 person the achieve, then all go down to restart checkpoint back into the safe room. Then go kill warden agian, and knock it out for the 2 others.
Tip:Mac's bleed card for the boltok is extremely deadly to the warden. He can solo the first few rooms if you manage your actives.

Finally, start up your match on The hive playlist under escape and get to the part where a boss will spawn about 80% the way through. It's either gonna be a swarm of little fishies,(What I call them) or the warden, dual wielding hammers. Warden is what you want. Kill him, have Lahni (person getting the achieve) pick up the hammer and run to the last room before the final room with the escape doors.

There should be 2 storage rooms on the left and right, and the way forward straight ahead. Have everyone go into the right room and wait, have 1 person run into the escape room only a few feet is needed. Just to spawn the scions and enemies. Then run back to your buddies and wait for the scions and a cluster of enemies to get very close to your doorway. Once you see the scions close enough, along with their buddies, say 3,2,1 pop everybody's ultimate and the person with the hammer unleash RB (not RT)on every enemy you see including the scions and you should net the 9k after a few swings.

Doing it this way insures close quarters which is what you need, and more safety from going down as it's a tight area so you ain't getting hammered from afar. Theres Probably going to be a very easy strategy later on, but for now ill leave this up in hopes it'll help all of you as this game releases.

NOTE:The playlist I mentioned cycles after every week or 2, so it may not be there in 8 days from time of writing this. Either way, should help some people out and get the idea that the hammer is a good option for this achieve.

Tl;dr

Play The Hunters on intermediate. (enemies have more hp)
Choose Lahni and play it until the end. When you see the warden at the end of level, everybody active their abilities and kill it. I got the achievement while I just killed the warden only.

Good luck!

Me and my friends just got this if you go the map mines add in extra health we done it on a private match but It should work if you put it higher difficulty on a normal match make your way through the map then if you take the left safe room not the right or you won't get the wardens so once you go in the left safe room make your way through and you will come to a drop shot scion or a buzz saw scion pick up whatever one of these spawn as it will make short work of warden or wardens sometimes 2 spawn pick up breaker mace and make your way to the end press the button to close the gate then have the person with the mace to stand by the gate as its closing and there will be a load of juives and sires wait till they get close then everyone pop on their ultimates and the one with the mace just start crushing everything in sight and bleep bloop achievement the only thing we had was only the person with the mace had the achievement so we had to do this 3 times I don't know if there is a way around this but it takes no time at all to do this 3 times this is my first time writing a guide so hope this is ok for my first attempt any feedback welcome

The mace is an excellent way to obtain this achievement, the only down side is that the Hive may give you a different mini-boss (the Flock for instance).

If this is the case, you can still continue with your two partners and just make sure the one going for the achievement has 2 shock or incendiary grenades. These can be found in the supply rooms and possibly one in the safe room, so it is pretty easy to have the 2 you need by the end.

Once the final door is closing, have all 3 players activate their Ultimates, Juvies will begin to appear, the player going for the 9000 damage needs to toss the shock grenades so that the archway before the exit is covered wall to wall with electricity. The Juvies will run into the shock along with whatever drones and scions you left standing in the last room and you can fire away with whatever gun you have to net yourself the achievement.

It worked for all 3 of my team, we even let ourselves be caught inside with the Swarm so we could select to restart back in the Safe Room and quickly make our way back to the end as the achievement will pop as soon as you get your 9000 damage.

Increasing enemy health will help as you will need less enemies within the shock area before the 9000 damage is reached, but I got it on Beginner difficulty myself. Just left more drones alive in the last room.

Good luck!

How I got the "The Three Musketeers" achievement:

- Pick the Brawler Class with "All The Glory" card.
- Add Health Mod to cause more damage to Swarm enemies.
- At the end of a hive when the door is closing, wait for Swarm to spawn and group up.
- Run into the Swarm and activate your ultimate while spamming melee until all enemies are dead
- Your achievement should appear before the ultimate is even finished.

I did this achievement on "The Link" map, with me alone doing the 9000 damage!

***Remember the person that does the damage, get's the achievement***

You will have to do 3 seperate runs on "The Link" for everyone to get it!

Easy way to get this achievement:

Select hive The end, add mutator that increases enemies health, all three players select anchor class, any level/card will work. This class fills ultimate really fast and won't get downed when using it.

Start the level and go to the first room on the left, clear all enemies and a Salvo Scion will come from the area where you entered, enter the loot room if he doesn't show up thus forcing him to come, kill it and the player going for the achievement grabs the Salvo.
Your objetive here is the Salvo only, on the first room on the right side there is another Salvo inside the loot room, grab that too in order to have full ammo.

Now advance to the end area, where the exit is, after opening the gate, make some noise to get enemies attention, and move to the right side.
There is at least one Scion right in front of you and a few drones too.

All players activate the ultimate and the player going for the achievement unloads the salvo on the Scion firts then on some drones if it's necessary.
Done!

Must repeat from the start for other two players.
I skipped some obvious information in order to keep the guide shorter.
Thanks to player Accept Downfall that gave the idea for this, although I changed some things after helping some friends to obtain this.