Dodge 4 bullets at the same time
Kill 100 Red Dudes with Uzi
Kill 100 Red Dudes with a pistol
Kill 100 Red Dudes with a sawed off
Kill 100 Red Dudes with a personal weapon
Complete the game in one sitting
Throw every available object on any level (exept tutorials)
Kill an enemy while not looking at him
Kill 3+ enemies with one burst while dual wielding uzis
Empty a handgun clip and kill enemies with every bullet
Burn atleast 1000 calories while playing
Punch a single guy at least 5 times in a row
Complete 10 min challenge
Complete NoGuns challenge
Complete Sniper challenge
Complete Speedrun RealTime challenge
Complete Speedrun GameTime challenge
Complete NoDeath challenge
Complete Hardcore challenge
