Overtime mode is the final chapter, which is unlocked by completing all previous seven chapters within the seven day time limit and delivering Rhonda to Gary in Chapter 7.
If the game is partially installed, then the mission "Explore while Rhonda is busy.." will not end until the installation is completed, and no game time passes during it. So if you start the game from partial install and then unplug or disconnect your internet connection, you can level and grab combo items in the initial area for as long as you like without using up any game time.
Complete Overtime mode.
Successfully complete Nightmare mode with an "S" rank.
Beat the game with S Rank/Ending.
| Achievement | How to unlock
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- A Little Ambition (5 points)
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- Almost Famous (25 points)
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- Certified Survivalist (5 points)
| - Win 25 Survival Training Bronze medals.
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| - Pick up 250 different weapons.
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- Complete the Package (50 points)
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- Day at the Museum (20 points)
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| - Drive 20 different vehicles.
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- Duct Tape Master (20 points)
| - Create every combo weapon.
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| - Defeat the envious survivor.
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| - Collect 100 different clothing items.
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| - Lead a full posse of 5 survivors.
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- Genius of Zombie Slaying (25 points)
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| - Add 5 survivors to the survivor bulletin board.
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- Ladder Climber (10 points)
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- Left 100,004 Dead (30 points)
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- Man of the People (10 points)
| - Save 15 stranded survivors.
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- Master Builder (30 points)
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- Master Mechanic (10 points)
| - Create every combo vehicle.
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- Master of Massacre (20 points)
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- Nightmare Master (75 points)
| - Complete chapter 7 in Nightmare Mode.
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- Prestige Hound (50 points)
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| - Complete 20 side missions.
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| - Max out a single attribute.
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- Survival Training Master (20 points)
| - Win 25 Survival Training Gold medals.
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- Survival Training Silver (10 points)
| - Win 25 Survival Training Silver medals.
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- T.I.O.D. Disciple (5 points)
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- The Doctor is Out (30 points)
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- Them’s the Facts (30 points)
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- Zombie Butcher (10 points)
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- Zombie Slayer (15 points)
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Combine the indicated items to create the corresponding weapon. Note: The blueprint locations may vary.
| Weapon | How to unlock
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| - Chemicals + Household Cleaner; blueprint found at frozen storage (farms) in South Almuda.
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| - Flare Gun + Chemicals; blueprint awarded for completing Chapter 04.
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| - Chemicals + Toy Robot; blueprint found at Sculpt Yourself store in Central City.
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| - Construct Hat + Keg; blueprint awarded for unlocking the Food Mechanic upgrade.
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| - Roman Candle + Crossbow; blueprint found at power plant in South Almuda.
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| - Robot Bear + Gasoline Canister; blueprint found at Burgess-Dawson building in Central City.
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| - Freedom Bear + Dynamite; blueprint found at tennis court (mansions) in Sunset Hills.
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| - Shotgun + Grenade; blueprint found at illegals hideout in Sunset Hills.
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| - Hub Cab + Hatchet; blueprint found at Ingleton taxi depot in South Almuda.
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| - RC Car + Grenade; blueprint found at family houses in Sunset Hills.
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| - Microwave + Motorcycle Engine; blueprint found at Museum of the Americas in Central City.
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| - Game Console + Battleaxe; blueprint found at barber shop roof in Ingleton.
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| - Fire Axe + Hatchet; blueprint found at Roof adjacent to illegals hideout in South Ingleton.
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| - Harpoon Gun + Fire Axe; blueprint found at Museum of the Americas in Central City.
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| - Freedom Bear + Portable Stereo; blueprint found at toy store roof (near karaoke bar) in Sunset Hills.
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| - Grim Reap + Reaper Mask; blueprint found at shack roof (near gun store or southern safehouse) in Ingleton.
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| - Cuddly Bear + Wheelchair; blueprint found at rooftop (near tennis court) in Sunset Hills.
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| - Fire Axe + Sledgehammer; blueprint found at house construction site in Sunset Hills.
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| - Boxing Gloves + Motorcycle Engine; blueprint found at Sunny Luck Fortune in Southern Ingleton.
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| - Dynamite + Hunk of Meat; blueprint found at workbench in warehouse C-114 at plane hangar (Chapter 02).
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| - Wheelchair + Battery; blueprint found at Meryl's home in Sunset Hills.
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| - Sledgehammer + Battery; blueprint found at cemetery sewers area in Ingleton.
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| - Leaf Rake + Battery; blueprint found at train repair station in South Almuda.
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| - Wheelchair + Dynamite; blueprint found at central courts area in Central City.
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| - Game Console + Toy Gun; blueprint found at Slappy's Toy Store in Sunset Hills.
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| - Motor Oil + Crossbow; blueprint found at strip club in Ingleton.
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| - Grim Reaper + Gasoline Canister; blueprint found at sword store (near burger restaurant) in Ingleton.
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| - Mecha Dragon + Firecrackers; blueprint found at northwestern houses in Ingleton.
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| - Leaf Blower + Cooking Oil; blueprint found at Wrench-O-Rama DIY Store in Ingleton.
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| - Motor Oil + Boxing Gloves; blueprint found at collector's house in Sunset Hills.
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| - Motor Oil + Dragon Head; blueprint found at Zen Temple (Chinese Opera) in Southern Ingleton.
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| - Motor Oil + Broadsword; blueprint found at locker in Sunset Hills High School.
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| - Robot Bear + LMG; blueprint found at Sunset Ties (adjacent rooftop) in Sunset Hills.
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| - Cardboard Cutout + Pogo Stick; blueprint found at bus depot in South Almuda.
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| - Scythe + Katana; blueprint found at fenced area (near sewer entrance) in Ingleton.
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| - Football + Grenade; blueprint found at Package Force Delivery Company in Ingleton.
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| - 2×4 + Lead Pipe; blueprint found at bus roof or Rhonda's garage in Ingleton.
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| - Afro Wig + Dynamite; blueprint found at Felicia Building in Central City.
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| - Propane Tank + Gasoline Canister; blueprint found at church chapel in Ingleton.
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| - Metal Cleaver + Machete; blueprint found at church in Ingleton.
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| - Cardboard Box + Toy Robot; blueprint found at Rhonda's Garage in Ingleton.
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| - Handgun + MMA Gloves; blueprint found at Bibi's Box in Sunset Hills.
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| - Outdoor Trash Can + Garbage Bag; blueprint found at Crystal of the Sea in Central City.
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| - Wheelchair + Battery; blueprint found at Meryl's home in Sunset Hills
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| - Flashlight + Gems; blueprint found at underground parking lot in Central City.
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| - Katana Sword + Machete; blueprint found at Museum of the Americas in Central City.
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| - Mecha Dragon + Katana; blueprint found at shack roof (near sewer entrance) in Ingleton.
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| - Dragon Head + Parasol; blueprint found at Zen Dragon Temple courtyard in Ingleton.
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| - Bowie Knife + Football; blueprint found at cemetery sewer entrance in Ingleton.
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| - Metal Cleaver + Chainsaw; blueprint rewarded for completion of Craven Consult sidequest.
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| - Motor Oil + Propane Tank; blueprint awarded for completing Chapter 03.
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| - Toy Robot + Boxing Gloves; blueprint found at toy store (north of Food Fun Shack) in Sunset Hills.
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| - Spear + Hat Rack; blueprint found at motel hideout in Ingleton.
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| - Lead Pipe + Chemicals; blueprint found at collector's house in Sunset Hills.
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| - Sledgehammer + Grenade; blueprint found at warehouses in South Almuda.
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| - Dynamite + Laptop; blueprint found at central illegals hideout in Sunset Hills.
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| - Battery + Blanka Mask; blueprint found at Food Fun Shack in South Sunset Hills.
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| - Boxing Gloves + Acetylene Torch; blueprint found at taxi depot in Ingleton.
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| - Sawed-Off Shotgun + Machete; blueprint found at quarantine area exterior in Sunset Hills.
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| - LCD Monitor + Keg; blueprint found at viaduct.
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| - Battery + MMA Gloves; blueprint found at Robsaka Digital in Central City.
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| - Broom + Boxing Gloves; blueprint location unknown.
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| - Sledgehammer + Cement Saw; blueprint found at diner in Chapter 00 (Prologue).
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| - Baseball Bat + Box of Nails; blueprint found at northwestern home exterior in Ingleton.
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| - Meat Cleave + Bucket; blueprint found at Big Bulls Butchery in Ingleton.
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| - Assault Rifle + Lead Pipe; blueprint found at taxi company in Ingleton.
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| - Scissors + Grenade; blueprint found at taxi company depot in Ingleton.
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| - Motorcycle Engine + Crossbow; blueprint found at central storage in Sunset Hills.
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| - Massager + Leaf Blower; blueprint found at strip club (second floor, near the bus station) in Almuda.
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| - Flashlight + Handgun; blueprint awarded for completing Chapter 00 (Prologue).
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| - MMA Gloves + Car Exhaust; blueprint found at boxing gymnasium in Ingleton.
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| - Boxing Gloves + Broom; blueprint found at Uno Grande in South Almuda.
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| - Death Mask Reaper + Gasoline Canister; blueprint found at playground in Ingleton.
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| - Shopping Cart + Pitchfork; blueprint found at access tunnel (between subway station and warehouse) in Sunset Hills.
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| - Shotgun + Assault Rifle; blueprint found at central police station in Chapter 03.
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| - Katana Sword + Leaf Rake; blueprint found at Los Perdidos Communications Company in Sunset Hills.
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