Get the Good Ending 
     To  get  the  good  ending,  save  at  least  50 Innocents before
returning to the train.
 
Infinite Glyph Glitch 
     When  playing, have two players access a permanent increase Glyph
(either  Strength  or  Accuracy)  at  the same time and the Glyph will
always  be  available.  The regular Glyphs (Health and Conviction) are
disabled  on  the  fourth use; if one player uses a Health Glyph three
times,  have two people use it at the same time for the fourth time to
enable the glitch.

Unlock Nightmare Mode 
     To  unlock  Nightmare  Mode, finish the game once. Nightmare Mode
will be available in the Special Features menu when you begin again.
 
Unlock Ultimate Hunter Mode 
     To unlock Alternate Hunter Mode, complete the game once. Now each
hunter  will  have  a different costume to select. Turn the Mode on at
the Special Features screen.