Apocalypse Mode is the full experience of the game, consisting of a combination of the other two game mode, Scavenge Mode, Survival Mode, and Challenges if you're in ReAtomized. It is mostly used and the house is different every time.
- Try to collect at least three food and three water
- At least one Family Member
- Gas Mask for expeditions
- Boy Scout Handbook
And if you have extra time...
If you cannot grab all of them, make do with most of them. If you at least have the food and water, gas mask, medkit, map, and axe, you'll survive comfortably.