The Save the World Free with new for Fortnite has 45 achievements worth 1,000 gamerscore.
Protect the survivors
Craft your first weapon
Complete your first mission
Complete "Homebase Storm Shield Defense 1"
Unlock access to the Constructor Hero
Complete "Before and After Science"
Complete "Ride the Lightning"
Unlock and Slot your first Storm Shield Defender
Unlock and Slot your first Mission Defender
Complete "Retrieve the Data"
Complete "Rescue the Survivors"
Complete "Homebase Storm Shield Defense 6"
Complete all the Main Quests in Stonewood
Complete "Epic Troll Stash"
Complete "Plankerton Storm Shield Defense 1"
Complete "Two Swirls"
Complete "Ray.README"
Complete "Six Minutes"
Complete "Rifty Business"
Complete "Shelter Skelter"
Complete "The Battle of Plank Harbor"
Complete "Plankerton Storm Shield Defense 6"
Complete all the Main Quests in Plankerton
Complete "Canny Valley Storm Shield Defense 1"
Complete "Quad Squad"
Complete "Canny Valley Storm Shield Defense 6"
Complete all the Main Quests in Canny Valley
Complete "Twine Peaks Storm Shield Defense 1"
Complete "Twine Peaks Storm Shield Defense 6"
Complete "Hero Training - Stage 2"
Complete "All Together Now" (Daily Quest)
Complete "Survivor Training - Stage 2"
Complete "Defender Training - Stage 2"
Unlock access to the Outlander Hero
Unlock access to the Ninja Hero
Complete "Weapon/Trap Evolution"
Complete "Toxic Treasures - Stage 10"
Build 500,000 Structures in successful missions
Destroy 100 Garden Gnomes in successful missions
Save 10,000 Survivors in successful missions
Loot 300 Treasure Chests in successful missions
Fully explore 1,500 zones in successful missions
Kill 20,000 Mist Monsters in successful missions
Complete 1,000 Play With Others missions
Complete "I'm Probably Dead"