Full list of all 41 Silent Hill: Downpour achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox 360.
Achieved "Surprise!" ending.
Killed or incapacitated 10 Prisoner Juggernauts.
Killed 25 monsters with the Pistol or Shotgun.
Completed the "Digging up the Past" side quest.
Killed or incapacitated 10 Weeping Bats.
Achieved "Full Circle" ending.
Completed the game on the hard game difficulty setting, any ending.
Achieved "Forgiveness" ending.
Completed the game on any difficulty without killing any monsters.
Completed Murphy's Journal with all Mysteries.
Achieved "Execution" ending.
Achieved "Truth & Justice" ending.
Completed the game on the hard puzzle difficulty setting, any ending.
Reached Overlook Penitentiary.
Completed the "Bird Cage" side quest.
Completed all side quests.
Completed the "Mirror, Mirror" side quest.
Completed "The Art Collector" side quest.
Completed the "Ribbons" side quest.
Completed the "Shadow Play" side quest.
Killed or incapacitated 10 Prisoner Minions.
Completed the "Homeless" side quest.
Completed the "Dead Man's Hand" side quest.
Completed the "Ashes to Ashes" side quest.
Defeated The Bogeyman.
Collected 3 pages of the rhyme book.
Incapacitated 20 monsters without killing them.
Killed or incapacitated 10 Dolls.
Completed the "Cinéma Vérité" side quest.
Completed "The Gramophone" side quest.
Escaped the Radio Station Otherworld.
Met DJ Ricks in the Radio Station.
Used 20 First Aid Kits.
Completed "The Bank" side quest.
Completed the "Stolen Goods" side quest.
Escaped from 20 monsters.
Completed the "All Points Bulletin" side quest.
Killed or incapacitated 10 Screamers.
Escaped from Devil's Pit.
Rode the Sky Tram to Devil's Pit.
Survived the Diner Otherworld.