Ambassador Accolades (Tesla Rifle, Space Outfit costume, and UFO ending): Successfully complete the game. Then, pick up "Room 502 Key" on the stairs at the beginning of the next game, and use it in the motel.
Brawler costume: Kill over 50% of enemies with only your fists.
Butcher Accolade (Great Cleaver weapon, Butcher costume that grants immunity from Straightjacket acid spit, and Bad ending): Successfully complete the game. Then, start a new game from your cleared saved game, and accumulate 100 kills. At the end of the game (not the UFO ending), you will see what Travis has become.
Cartographer costume: Check the map less then 25 times.
Collector costume: Collect more then 300 items.
Daredevil: Successfully complete the game without using any saved games.
Explorer costume: Run or walk over 22.5 km.
Fireman Accolade (Fireman's Axe weapon and Fireman Costume): Rescue Alessa from the fire at the start of the game in under 80 seconds.
Konami Code Accolade (Vincent from Silent Hill 3 costume): At any time during your second or later replay, press Up(2), Down(2), Left, Right, Left, Right, X, Circle.
Savior Accolade (Lonely Moon gauntlets weapon, Lonely Moon Leather costume, and Good ending): Successfully complete the game with the Good ending. The Good ending is the default ending unless you qualify for the UFO or Bad ending.
Savior costume: Successfully complete the game.
Sharpshooter costume: Kill over 75% of enemies with a firearm.
Sprinter Accolade (Fitness Costume that grants Unlimited Fatigue): Successfully complete the game in under two hours.
Stalker Accolade (Night Vision Goggles and Black Ops costume): Have the flashlight on less than three hours during the game.
Weaponsmith costume: Kill over 75% of enemies with melee weapons.