"Inconceivable takes a more Survival based twist, giving you less health than Insane difficulty but also less health to your enemies. That’s because surviving on Inconceivable is all about effectiveness - weapons and crates drop significantly less ammunition, so you’ll have to make every shot count with whatever pickups you can find on the battlefield.
Unlock Inconceivable Difficulty for Campaign by beating the Campaign on Insane."
There's two ways to go about this
Method 1: Simply playing it legit. This would be extremely difficult and a challenge id imagine only few would attempt and have the patience to complete.
Method 2: The same casual coop method can be used here as well. When playing coop one person can choose their difficulty as casual and the other person can play on Inconceivable. This way the person on casual can go do all the work while the other person sits back and stays safe. Doing this will of course mean you have to run through the campaign another time where you switch roles with your partner so you can both get the achievement but you'll end up spending less time then doing it on Inconceivable only.Helpful Tip:
Have the Host choose casual, and the second player choose Inconceivable when the game loads up. (This is just a helpful tip for one part of the motorcycle section in Act II. More info below)Note:
Can be done in split screen
Whichever way you choose i will do my best to provide help to make things easier. If using the coop method then you shouldn't have too much trouble but this may help you on some of the difficult parts.TipsGeneral:
-Since you would've had to have done Insane already it goes without saying that you should know how to take it slow and take care of all the enemies before moving on
-Since ammo is scarce you'll probably have to be picking up weapons constantly however if you run out of ammo you can trade it to one of your AI teammates and they will reload the clip.Prologue:
-You can grab the Despicable You Freeze gun. it only has 12 ammo but may help (cant be done with coop method)
-In coop when you get to the part where there is a cutscene of a mortar coming at you we had the issue where it would kill the person on Inconceivable without giving them the chance to move. However, The checkpoint reloads and you'll already be dead but luckily the ai takes over your character and your partner can complete the section.Act II:
- In Chapter 2 Dom's Toms grenades can be earned by shooting all plant pots in the greenhouse.
-In coop its best to have the host be the one to choose casual and the other person change their difficulty to Inconceivable. This is helpful only for the motorcycle section. When the helicopter is shooting at you he mainly focuses on the one upfront which is always the host. We found that Its much easier to dodge the bullets and missiles if in the back because when you're up front on Inconceivable the helicopter bullets and missiles are much harder to dodge.
-However, if you already have the host being the one on Inconceivable we found the best way to get past it was have the person in back who is on casual stay on the right the whole time not moving much unless they have to, then the host on Inconceivable stay on the left and middle dodging everything. By having the casual player not really move a lot it seemed to take some of the helicopters attention away from the player up front.
-For extra help on this ending section check out Frizbog's comment posted here:
-In Chapter 2 you can get the Memento Mori:
Shoot the Gravestones marked MA, R, I, A.
"You can play until you get to the graveyard. Exit the game then when you load in have the second player choose Insane. All you need to do is throw a Grenade, shoot Ma, then take cover behind the long rock to the left. From here shoot r,i,a causing all enemies to despawn. I didn't fire a single shot at the enemies and I did it with 2 controllers."
Thanks to HolyHalfDead for the info. Note: Kexol says you should make sure you shoot them with your main account and not the guest.
-When you enter the circular room a pouncer will appear. after taking it out juvies will drop down. they all drop from the same spot so make sure the inconceivable player is on the opposite side of the room to give you space. Once you or your coop partner clear them out go to the other side as the next set of juvies will drop down from there. Lastly another pouncer will spawn that you'll have to deal with.
-In coop, After the "horde" type defend section you'll have to run uphill past enemies to press a button. only one person needs to do it so have the person on casual run to press it while you stay back.Act IV:
-On the Swarmack boss fight have the person on inconceivable go up to the stairs where the buttons are and stay at the end behind cover. This will make it easier to kill the juvies coming up to attack you while protecting you from the Swarmack shots while the person on casual does everything.Act V:
-For the final boss fight you have to learn the right timing to be able to dodge the shots. In coop, have one person all the way on the left and the other on the right. That way you only have to dodge one of the tentacle shots and not both as only one goes for each player by doing this.
These are what we found to be the most difficult sections of the game and some tips to get through them all, though you probably could've managed on your own as you can die as much as you want here. If you have any other tips to add or questions in general just leave a comment so i can update the solution.