Doom - Platform: Xbox 360

Secret Gamerpics:
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Successfully complete any level on the Nightmare difficulty setting to unlock a 
Gamerpic of a demon.
Get a 100% kill rating on any level on the Hurt Me Plenty or higher difficulty 
setting to unlock a Gamerpic of a Doom Marine.

Achievements:
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Accomplish the indicated achievement to get the corresponding number of 
Gamerscore points:

Neophyte (20 points): Successfully complete any level. 
Episode One (25 points): Successfully complete Episode 1 on the "Hurt Me 
Plenty" or higher difficulty. 
Episode Two (25 points): Successfully complete Episode 2 on the "Hurt Me 
Plenty" or higher difficulty. 
Episode Three (25 points): Successfully complete Episode 3 on the "Hurt Me 
Plenty" or higher difficulty. 
Episode Four (25 points): Successfully complete Episode 4 on the "Hurt Me 
Plenty" or higher difficulty. 
Rampage (35 points): Successfully complete all levels on UltraViolent mode. 
Nightmare (10 points): Win a Nightmare level in single player. 
Rookie (10 points): Get 50 kills on Xbox Live. 
Destroyer (10 points): Get 100 kills on Xbox Live. 
Scout (5 points): Find a secret area of a map. 
Hoarder (5 points): Find all items in level. 
Clean Slate (5 points): Kill all monsters in a level on the "Hurt Me Plenty" 
or higher difficulty.