Originally posted by www.ps3trophies.org
Mission 2: Raid - 4
Dossier 3 - Hodge Factions
After leaving the area where you helped Emma Frost. You'll exit the sewers and you'll be able to find this on your left side by the cliff.
Dossier 4 - Pyro
After the cut-scene of Cameron Hodge attacking a mutant child. Cross the bridge and defeat the enemies. Once they're defeated simply look behind the water tower to find it.
Dossier 5 - NightCrawler
After speaking with Reyes after you knocked down the tower. Simply turn around to find the dossier near a couch.
Dossier 6 - Cyclops
After deciding to join either Cyclops or Quicksilver, defeat the waves of enemies in the next area. Once you've defeated them continue the X-Marker and you'll find it on the left side by trash can containers
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For the Propaganda i'm really sorry but i already collected it all, maybe one of you guys got a savegame where u got less than 34 Propaganda collected.
Now you have only to complete the Campaign on Xtreme Difficulty, during some Combo Trophies and collect 25 out of 34 Propaganda and you will got Platinum
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Theres a glitch for getting the trophy for completing the game on xtreme: