Help Will Come Tomorrow

This requires you to build everything in the camp. That includes completing every upgrade for every structure. There are 5 structures in the camp with 5 upgrades each. This will require a lot of materials while also remembering to manage your survivors' needs so they can continue to work on building and upgrading the structures in your camp. Bad weather, especially after day 15, can bury or completely destroy anything you build in your camp. Also, the game’s RNG can trigger events that may damage or destroy your structures. 

When building anything, you can choose the “Makeshift” or “Solid” option. Makeshift uses less materials but can be damaged or broken more easily. Solid uses more/rarer materials but is damaged or broken at a slower rate. I recommend building everything as makeshift, focusing on building as quickly as possible and reloading the game if a negative event sets you back.