Full list of all 16 ICO trophies - 2 bronze, 4 silver, 9 gold and 1 platinum. It takes around 12-15 hours to unlock all of the trophies on PlayStation 3.
Bring the watermelon to Yorda upon completing 2nd time through
Acquire shining sword
Clear the game without viewing a game over screen
Beat the game within 4 hours
Acquire spiked club
Clear the game
Acquire Queen's Sword
Finish watching farewell demo scene with Yorda at the front gate stage
Open West Gate
Save at all save points
Open East Gate
Acquire Sword
Finish watching the demo scene confronting the Queen at the front gate stage
Rescue Yorda
Acquire all trophies
Beat the game within 2 hours