Here is the full list of all 28 Silent Hill 2 HD trophies - there are 10 bronze, 12 silver, 5 gold and 1 platinum.
Unlock all Trophies in SH2.
Acquire the Green Hyper Spray.
Defeat at least 75 enemies by shooting in SH2.
Complete Boat Stage in less than 1 min 20 seconds.
Unlock the "Dog" ending.
Defeat at least 75 enemies by fighting in SH2.
Acquire the Dog Key.
Unlock the "UFO" ending.
Acquire the Blue Gem.
Unlock the "Rebirth" ending.
Complete SH2 on Extra Riddle difficulty.
Acquire the book of Crimson Ceremony.
Acquire the Obsidian Goblet.
Acquire the book of Lost Memories.
Unlock the "In Water" ending.
Unlock the "Maria" ending.
Receive less than 500 points of damage in one game, in SH2.
Find at least 150 items + extra items in SH2.
Acquire the White Chrism.
Acquire the Chainsaw.
Unlock the "Born from a Wish" ending.
Unlock the "Leave" ending.
Complete SH2 with 2 saves or less.
Complete SH2 in 3 hours or less.
Defeat Mary.
Defeat Pyramid Head.
Defeat Abstract Daddy.
Defeat Flesh Lips.