How do you unlock weapons in team fortress 2

Weapons for Team Fortress 2 can be unlocked by differnt methods;

• Achievement Milestones (Example Below)
  • Scout Milestone 1 (Reward: Force-A-Nature)
  • Scout Milestone 2 (Reward: Sandman)
  • Scout Milestone 3 (Bonk! Atomic Punch)

• Mann Co Supply Store (This makes your account Premium if you are Free To Play)
• Item Drop System (Premium Account needed for better items)
• Crafting
• Trading (Premium Account needed to trade your items)