Successfully complete the indicated task to unlock the corresponding item:

  Bike helmet: Win a bike race. 
  Bike shorts: Ride 100 km on a bike. 
  Black cowboy hat: Give a homeless man spare change in Bullworth. 
  Black Ninja costume: Completely fill your yearbook. 
  Black skate shoes: Walk at least 50 km. 
  BMX Champion costume: Successfully complete a bike race. 
  Boxing costume: Successfully complete the Boxing Challenge or Prep Challenge 
  in Chapter 2. 
  Burglar mask: Found in a locker on Halloween. 
  Cheerful reindeer sweater: Found in the school office during the winter. 
  Crash helmet: Finish in first place in the Kart Race at the Carnival. 
  Dunce cap: Fail three classes in a row. 
  Edna mask: Destroy all nineteen tombstones. 
  Fast Food costume: Successfully complete the Burger Joint errand in Bullworth 
  Vale. 
  Firefighter's helmet: Pull the fire alarm twenty times. 
  Graduation hat: Successfully complete all five levels in all of your classes. 
  Gnome costume: Smash all the garden gnomes. 
  Go Kart: Win all Go Kart races. 
  Gold suit: Buy all the clothing. 
  Green Ninja costume: Hit targets with projectiles 1,000 times. 
  Grotto Master costume: Collect all G&G cards. 
  Incognito hat: Successfully complete Errand #21 near City Hall. 
  Jimmy's Skeleton Halloween costume: Successfully complete the "The Candidate" 
  mission to unlock the "Halloween" mission. 
  Orderly uniform: Successfully complete "Finding Johnny Vincent" in Chapter 5. 
  Pirate hat: Beat up the pirate on the island near the beach house. 
  Prison uniform: Successfully complete all the detention mini-games. 
  Pumpkinhead mask: Destroy all 27 pumpkins around the school and inside the 
  main building. 
  Red Ninja costume: Successfully complete the Big Prank task during Halloween 
  at Bullworth Academy. 
  Rubberband ball: Collect all 75 rubberbands. 
  Running shorts: Run or walk 40 km. 
  School Mascot costume: Successfully complete the "Nice Outfit" mission in 
  Chapter 4. 
  Soda hat: Drink 500 sodas. 
  Tiny swimsuit: Find the preppie with a blue mission on the beach at the beach 
  house and beat his swimming time. 
  Viking helmet: Get all collectibles. 
  Werewolf mask: Found in a school locker after picking the lock. 
  Wrestling uniform: Successfully complete Gym 1. 
  Yellow Ninja costume: Get 1,000 knockouts of people, students, etc.