So here it is, the ultimate guide to the Doomsday Heist. If you have any better tips then add them below and I'll edit the guide accordingly.
I've purposely left off the Preps due to just how easy they are.
So, here goes!
Doomsday Heist Top Tips
Paramedics: After clearing your way through the enemies, get in the 4x4 to the right of the exit. Do not drive out the front, drive out the back area and towards the junction at Mission Row for extraction. No police will follow you.
Recovery: Take the Armored Kuruma, kill all enemies, collect the Savage and trigger the checkpoint. Take out any choppers but be wary of the police on the ground as you don't want to explode the Paramedic team's escape vehicle. Land at the Mission Row junction to extract the Paramedic team.
Signal: Get in front of the armoured trucks with the Deluxos to avoid being shot at during the hacking. When hacking the boats, swing from side to side to minimise being shot at. When hacking the plane, have one person hack and the other(s) fall back to take out the enemy Valkyries.
Server Farm: Stealth kill all enemies outside. This will prevent the alarm going off inside. Shoot the first scientist in the back. If you go for the head and miss, hitting the glass, it can sometimes trigger the alarm. Be sure to stealth kill everyone to prevent the alarm going off early. To make this mission safer, all collaborate at C or D to wait for the last hack and move forward to the stairs together when the alarm goes off. C and D are slightly closer to the central structure you need to get to once the alarm triggers. The best weapon here is the Combat MG with Incendiary rounds as it can shoot at distance and has the ability to knock over enemies which will buy you time to recover and finish anyone off, especially when it gets too heated. Travel along the right-hand side wall to minimise angles you are shot at. Make sure you clear enough enemies close to you and around the central structure before moving on to the stairs.
When outside, run to the wall in front of you in cover. One person should take out the three NOOSE NPC's who come round the side wall. Shoot at the NPCs in the choppers. When clear, rush to the ladders. The first little ladder can be a pain in the arse to get onto, so you can always go round the side of the wall and climb up instead. It’s unlikely that you will be shot at much once you’re on the 3rd ladder, so you’re pretty clear from here.
Date Breaches: Take the Vigilante and blow up the first set of enemies with its missiles. The best starting weapon is probably the Special Carbine Mk II due to its accuracy at range. It’s also very good for getting quick headshots. Depending on how many players you have with you, try to cover all angles as you make your way through the first 2 corridors. When you go down the first set of stairs switch to the Assault Shotgun as this will blast enemies at close range with just 2-3 shots. Once at the final guns, hold L2 and R2. L2 fires a machine gun while R2 fires missiles. This will eliminate the enemies quicker.
Avenger: Run to the cabins on the right-hand side and take out the enemies from here. Most enemies here are very hard to see, so keep aiming and re-aiming as you move forward. Take the stairs behind the cabins on the right-hand wall. Move slowly and check your thermal vision from your Heavy Sniper Mk II to spot any more enemies. Lots more enemies spawn above and below you, so be cautious when moving on. Make sure all NPCs are dead before switching the generators back on to avoid being shot.
Ground Team: Take the weaponised Insurgent and park it right outside the Foundry door. The first part is the hardest due to the confined space, so take your time and take pop shots at the enemies until you can move forward. When you’ve rescued the ULP - if your team followed the Lookout Team guidelines - there will be lots of enemies outside but these are easy enough to kill. Hop into the weaponised Insurgent and off you go. The buzzards can shoot missiles, which is why the Insurgent should be used as it can take the hits.
Lookout Team: Take the Armored Kuruma and kill the first set of enemies without taking any damage. Trigger the first checkpoint up the ladder then hop back into your Kuruma and go inside the Foundry. You only need to stay in the first small corridor. Keep an eye on any enemies coming through the door and blast them with the Assault Shotgun. There should only be 2-3 enemies coming through that door. When the ULP has been rescued there will be lots of enemies outside but these are easy enough to kill. Hop into the Insurgent and off you go. It’s best to have the CEO as Lookout as the Ground Team can get health regeneration when in close proximity and they’ll be taking most of the damage.
PS. If you hang about too long in the Kuruma when the Buzzards spawn you risk being blown up by its missiles.
Salvage Hard Drives:
Operators: The driver is the most important person here. They should let you know when you should get out to avoid your teammates getting knocked over if they decide to move off suddenly. The driver can protect the Salvage Team by blocking off enemy fire. Just be aware that you can be shot at quite easily if you’re not in a good spot, so have your interactions menu open ready to equip body armour and eat snacks. Makes sure to help the Salvage team by firing the water cannon at close enemies to knock them over or kill them.
The first two locations are pretty simple. The third location is the most troublesome due to how many enemies keep spawning. It’s usually better to put out all the fires first before the Salvage team collect the Hard Drives. For the final location, drive straight to the middle of van A and B right up against the wall. If you have enemies close by, hit them with the water cannon to buy you more time and to prevent being shot. Put out both fires from here then go to C and D. After putting out E, cover the Salvage Team with the truck while they collect the hard drives.
Salvage Team: Always wait for the Driver to let you know when to get out. Stay close to the Riot Control Van to give you more cover while you kill off the NPCs and collect the hard drives.
Submarine Recon: Have one person lead and another hang back a bit to take out the choppers while the lead takes out the trucks. The choppers have the ability to launch missiles at you so it’s important that these do not get forgotten about. The rest is pretty simple.
The Bogdan Problem:
Air Support: Method 1: Simply fly around avoiding the attacking choppers until the Submarine Team have evacuated the sub. When they have evacuated, enemies will concentrate their fire on them, allowing you to take them down. Land on the peninsula beach (at Paleto Forest) to extract them. It’s best to expand your radar so you can get a better view of where the enemies are.
Air Support: Method 2: Call in the Savage and land the Avenger on the peninsula beach (at Paleto Forest). You can take out the enemy choppers using the Savage. The Avenger will take almost no damage this way as the enemy’s fire will be aimed at you. You can get shot down by choppers, so just be aware of this. There is a constant stream of Buzzards spawning right on top of the rocks at Paleto Cove. If you position yourself here you can blow them up before they even have time to get going. Once all enemies have been eliminated after the Submarine Team have evacuated the sub, head back to the Avenger and fly off.
For Method 2, you can which a video of it here:
Submarine Team: 2 Players: Player 1 heads to the left and towards the control room and waits here until they need to take a photo of the panel. Player 2 heads to the right and down the ladder towards the prisoner. Aim your weapon at the prisoner to trigger player 1’s objective to take the photo. You don’t need to move from here, just wait for the cutscene. When evacuating the sub, head towards the peninsula beach for extraction. A good indicator is to see where your personal vehicle is on the map and head towards that.
Submarine Team: 1 Player: Head right and down the ladder towards the prisoner. Aim your weapon at the prisoner until he starts speaking then head back and up the first set of stairs towards the control room. Take your photo, plug in Clifford and wait for the cutscene. When evacuating the sub, head towards the peninsula beach for extraction. A good indicator is to see where your personal vehicle is on the map and head towards that.
Use the Assault Shotgun as it will obliterate all enemies at close range quickly.
Doing both methods should give you enough time to complete the Elite Challenge with ease.
Rescue Agent 14: Take an Armored Kuruma and a Vigilante. Kill everyone in the warehouse using the Kuruma then park it safely out the way of the entrance. Before going over to Agent 14, lay out 5 Sticky Bombs where the Juggernauts spawn. There are 5 sticky bombs on the container at the entrance as well as body armour. When the Juggernauts spawn, detonate the sticky bombs and take out any remaining Juggernauts with miniguns. Get into cover from the other side and minigun the other 4 Juggernauts. Wait for the enemies to drop down from the helicopter, kill them, then get back into the Kuruma. Kill everyone in your way but be wary of the Buzzard that spawns as it can fire missiles at you when you’re in a vehicle. For the last 2 Juggernauts, have someone be ready in the Vigilante on the road to make short work of them with its missiles.
Escort ULP: Take an Armored Kuruma to wipe out the first set of enemies at the Chernobog. If you have more than 2 players, take an Insurgent to protect yourself from the attacking helicopters and other NPCs. The driver of the Chernobog can hold right on the D-pad to brake and activate the missile launcher instead of braking first. When stopping, aim the Chernobog at an angle to help shield yourself from any NPC’s fire. Find a good spot to stop where the person on the missile launcher can shoot in most directions. If you have a 3rd or 4th person, they can go off-road and take down any other helicopters with homing launchers, or they can simply stay in the insurgent for safety.
Barrage: Wait for the Cargobob to be overhead before taking it down so that the Barrage doesn’t land in the awkward roads around Vinewood Hills, or worse yet in someone’s swimming pool! Head through the tunnel at Vinewood Hills and to the Sandy Shores airport. Keep your distance from the approaching airplane where you can all take it down with RPGs, Homing Launchers and the Barrage’s 50. cal. Move forward behind the exploded airplane and use the Heavy Sniper Mk II to explode the vehicles on the runway without getting hit. Finish everyone off with the sniper then simply drive to the last checkpoint.
Khanjali: Take an Armored Kuruma and a large vehicle. The team in the Kuruma can kill all the enemies and blow up the equipment when the coast is clear. The team in the large vehicle can use it to hop onto and climb over the wall near the Khanjali. The Kuruma team can then drive to the final location at Lago Zancudo and wait for the Khanjali. When the Khanjali arrives, all get it in to it complete the setup. If you all get in the Khanjali then you’ll have more enemies to deal with. This way you won’t have any Hunters spawning as you’ve not triggered them to attack.
Air Defenses: Leave the dropping of the carpet bombs to the pilot as they’ll have a better idea of timing. That is all.
The Doomsday Scenario: BEWARE! If you take the Barrage you’ll sell the tank and the host will receive $100k from its sale as opposed to $50k from selling the Barrage. However, recently there has been a glitch where the guys on the 50. cals on the Insurgents in the tunnel can kill you within 1 or 2 shots even if you have full health and body armour. I’ve even had it where all three of us have all died at exactly the same time from the very same bullets within milliseconds. You can complete the Elite Challenge if you do take the tank, it just means that you’ll need to be quicker making your way through the facility.
Take out the Juggernauts with your miniguns. Go for headshots as they’ll die quicker and will add to the 150 you need in order to complete the Elite Challenge. Use the Special Carbine Mk II or the Bullpup Rifle Mk II as it’s easier to get headshots. DO NOT use special ammo here, especially the incendiary rounds as the enemies will fall to the floor straight away and you’ll struggle to get your headshots. Also, do not use the Combat MG as this isn’t as accurate and can also knock over your enemies. When you hit the cutscene where Clifford opens the facility’s doors head up the stairs to the left as this is where the first server location is. Make sure you equip body armour and eat snacks to full health before you move on from here. It’s best to have the CEO hack as everyone else in close proximity will get health regeneration from their presence and the CEO will not get shot at while hacking. However, the person hacking may take a few shots when the hacking is complete before they can move into cover. Tell your team when the hacking is almost done so they can prepare more body armour if needed. All run together when moving from server to server, don’t concentrate on shooting enemies unless you need to.
When at the Orbital Cannon, designate who will go for what letter. To do this the fastest...
2 Players: Player 1 to A and B, Player 2 to C and D.
3 Players: Player 1 to A and B, Player 2 to C, Player 3 to D
4 Players: One each.
Head down the centre stairs then hop over the side and down to the lower floor. This will save you some valuable time. Stick together and move fast, making sure not to shoot the boxes in the tight corridors as these can explode. It’s important that you stay near each other just in case someone needs to reload. If someone is lagging too far behind don’t worry about them as it only needs one person to reach the checkpoint before the Thruster jetpacks.
When in the jetpacks, head straight for Avon and don’t worry about the helicopters. Once Avon is killed the helicopters will cease to attack.