Reach home in chapter 1.
Collect a COLT45 or Luger.
Reach bunker in chapter 1.
Reach graveyard in chapter 1.
Collect a box of grenades.
Collect a MP40 or STG44.
Reach trainyard in chapter 1.
Collect a M1 Garand or KAR98.
Bury a tomb in graveyard.
Break a fence in trainyard.
Get a radio signal.
Get a gold bar.
Use dynamite to open mine.
Reach castle in chapter 2.
Desactivate spikes in castle.
Reach prison in chapter 2.
Meet the monster in prison.
Complete the town in survival mode.
Get the briefcase in town.
Finish the game chapter 2.
Discover the new area in chapter 3.
Complete the game chapter 3.