I would like to note that I was in
TheBigTicket94 's group as the Moira. I decided to have a written explanation as well as add my perceptive. If you want to see McCree's POV, go see his solution.
[Edit]:
Epilepsy Sucks has informed me of methods that his group used to deal with the Heavy Assaults. They have been added and you can choose which one you think your team will work better with.
Enemies*** Spoiler - click to reveal ***Troopers
These are the most common type of enemies. They have the smallest health pool and lowest damage, but their damage is still not something to shrug off. If you get too close, they will melee you. If someone dies to one, laugh at them cause they got Troopered™.
Enforcer
These are the second most common. They have a shotgun which needs to charged and can two shot the players. They have shields and can be stunned to interrupt their shotgun. Genji can also cause a lot of damage with deflect.
Sniper
Like Widowmaker, this Sniper has a grappling hook, but has a pistol as close range damage. While she rarely one shots anyone, she can pick someone off if their health is low enough. Genji's deflect or McCree's Deadeye is usually enough to take them out.
Assassin
Assassins stick on walls as they teleport around. Once they teleported a few times, they jump down and run to their target. This run is limited and can be stopped by McCree's Flashbang. If she reaches her target, she will deal initial damage and continue to deal more. This will also take control way from the player. You can melee her to get her off.
Heavy Assault
These tanks have a Reinhardt charge and two Fusion Cannons. However, unlike D.Va, the Heavy Assault's Fusion Cannon have deadly range. If you get to close to one, they will melee you and knock you back. The charge is an instant incapacitate. After charging or being stunned by McCree's Flashbang, they will be confused for a second and will not attack. They cannot charge off ledges.
Part 1: Breaching the DoorThis section consists of 3 waves of enemies. Enemies will start to spawn on either sides of the door, in which case the siren above the door will light up and start blaring, or through the ceiling, in which case someone will call out the enemies, glass will shatter, and troopers will drop in the center.
If enemies come from the the side doors, more enemies will spawn on to the rooms beside of the doors. If enemies come from the ceiling, enemies will spawn in the room behind you.
When you clear all 3 waves, the door will open and you can proceed.
Part 2: Pre-Sniper RoadA small section with some enemies to your left and right. At this point, Reyes (Reaper) should teleport to the sniper's location.
When you clear all of the enemies, the sniper will spawn in with a cutscene.
Part 3: SniperAnother small section. Reyes should be up with the sniper and take her out with relative ease. Genji and McCree should take out the enemies that spawn across the exploded door and Moira should be healing the two on the ground.
When you reach the docks, the next enemies will spawn.
Part 4: The DocksDropships will come in with tons of Enforcers. Moira should use Coalescence as soon as the Enforcers touch the ground to take them out and heal allies at the same time.
Next, ships will come to the docks. McCree should use Deadeye to take all of the enemies on the boat and the Sniper.
Enemies will come out the door to the left. This is the door you want to go into.
Part 5: Hotel Room3 Troopers will crash in from the two side windows and the door. Some more will run up top. The door in the middle occasionally stay intact. If this happens, it will create an "invisible wall" of sorts that won't allow you to shot through it (although the enemies can still shot you). Also the doors aren't solid, but still block your view. It's a really annoying glitch.
The next wave will spawn once you step outside.
Part 6: Sniper BridgeTwo snipers will spawn as well as some troopers and enforcers. Moira should throw healing orbs in the hotel and keep everyone topped off. Reyes should kill enemies that come inside. Genji should try and deflect the sniper's shot and McCree can try and help both Reyes and Genji.
The next wave spawns when you reach the courtyard. Reyes and McCree should stay behind, across the bridge, Moira should be on the bridge to take care of Genji, and Genji should trigger the assassin.
Part 7: Assassin's CourtyardRun back to McCree and Reyes. The assassin will usually attack from the bridge or from the right. You should all focus her down, including meleeing whoever she pins. Some more enemies will come across the bridge. Clear them. McCree and Genji should go across the bridge, under arch, and take the stairs to the left to the high ground.
Reyes and Moira should move forward to spawn the next wave.
Part 8: Heavy Assault (HA) BridgeMoira and Reyes should return to the other two. Moira should stay with the Genji and McCree while Reyes should make sure not enemies come up the stairs. McCree should Deadeye and Moira should make sure he stays alive. When the HA is near the stairs, run back to the very first Sniper's position (the one that had the cutscene). Deal damage to the HA and if you need to, return to your original position near the courtyard/bridge, although be careful as enemies are constantly spawning, so some will be in your way. Keep doing this until the HA is dead.
Go into the the door across the HA's bridge, into the art gallery. If you want to charge your ultimates here, you can as enemies infinitely spawn.
Epilepsy Sucks' Strategy
There is a room across the bridge the HA spawns at. There is a way to get upstairs. The whole team should go up stairs and pump damage into him. When he gets close, the team should jump down into the courtyard and go around the building, counterclockwise as there is a pathway here near the water. Climb up the stairs, pump damage into him, and repeat. It's a bit more risky, but much faster.
Step into the center of the art gallery to spawn the next wave.
Part 9: Art GalleryYou should stay near the door and McCree should Deadeye to take care of the enemies who drop down. An assassins will spawn, so just deal with it like the one earlier.
Walk through the door across the art gallery. It will shut behind you when all 4 players enter.
Part 10: Extraction PointThere is a raised platform in from of you, the roof, that has chairs and silverware on it. It is
essential that you clear the tables and knock off chairs. Trust me.
Once you've done that, there's a room to the back left. Everyone should head there. Moira should stay in the corner away from the water, but close to the door and send her healing orbs in front of her so that it can heal everyone. She should try and not use all her primary healing all together, since she won't be attacking, but save it for when people are low or are expected to take damage. The other three should be killing everything outside.
For Snipers, you should try and only peek in between shots. Genji should try and deflect while McCree uses Deadeye behind him and Moira heals both of them.
For Assassin's you should melee her ASAP and just pump damage into her.
There are three waves with one boss in the first wave and two in the second. They are randomly Assassins and Snipers.
For the third wave, you're going to want to die. I don't mean in the game, I mean after doing it for 8 hours straight.
Back to the game, move to the balcony above the art gallery door. The HA will drop on the roof or on the floor between the kitchen (which is below the roof) and the art gallery door. You should try and bait it to move up while damaging it. When it does move up, drop down.
A second HA should be spawning right now. Try to get them together and play around the corners of the balcony and the are around the kitchen. If someone gets incapacitated, lure the HAs away and then go revive. Enemies will be spawning this whole time. Moira should use Coalescence (almost) as soon as she has it (you're going to get it a lot with all the healing). McCree can try to Deadeye the HAs, but it's a huge risk and not too much reward. Reaper should use his ultimate when you too many enemies are on you, but he should never chase for kills. This is all about poking.
When the first HA is dead. Keep playing how you've been playing. The last thing you want to do is die now. If someone gets incapacitated, lure the HA away. One is enough to incapacitate someone in a second.
I would HIGHLY suggest looking at TheBigTicket94's video as it includes our communication and communication is key since you need to improvise.
Epilepsy Sucks' Strategy
Note: This a more solid strategy than what I initially put up as the initial strategy didn't have too much cohesion. While I have not tested it (as I already have the achievement), it's one that I would recommend team's try out.
First off, let's list some new locations that I'll be referencing. There is an alleyway to the left, near the safe room and a blue room across the safe room, to the back right corner.
The strategy here was to get both HAs together. Once that's done, they would rotate from the alleyway to the blue room, to the bottom of the balcony's room, up the stairs to the balcony, and back to the alleyway. The HAs would get close enough so that they followed the same path. All along the way, they spammed damage to both of them.
This also allows players to be revived in safe positions as most place where you will be staying are not open to someone getting sniped across the map by an HA.
Once the HA is dead, everyone should move to the roof and wait for the ship. Enemies will still spawn and can kill you, so enter the ship as soon as it open up.
Video of
Moldy Tacos5000,
ReachDragon,
TheBigTicket94, and I.
The successful run starts at 2:35:20. My editor would zoom in when I tried to split the stream, so I gave up and just uploaded the whole thing.
If you have any Moira specific questions, I'd be happy to answer them.