Finished a level without dying
Finished TV chapter, kill TV head
Finished Streets chapter, destroyed the war train
Cleaned up the office chapter, destroyed the war aircraft
Finished the labs chapter, got rid of the ghosts
Finished the mansion chapter
Pushed more than 10 times the buttons of the factory level
Killed 100 Creepers
Killed 1000 Creepers
Killed 5.000 Creepers
Killed 20 Big Daddys
Killed 200 Big Daddys
Killed 20 Chickens
Killed 200 Chickens
Killed 20 Hunters
Killed 200 Hunters
Killed 20 Bombmen
Killed 200 Bombmen
Killed 10 Spartans
Killed 100 Spartans
Killed 10 Spidermine
Killed 50 Spidermine
Killed 10 Ballders
Killed 50 Ballders
Destroyed 10 Turrets
Destroyed 50 Turrets
Killed 10.000 Enemies