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.
Acquire all trophies
Rescue Yorda
Finish watching the demo scene confronting the Queen at the front gate stage
Acquire Sword
Open East Gate
Open West Gate
Finish watching farewell demo scene with Yorda at the front gate stage
Acquire Queen's Sword
Clear the game
Bring the watermelon to Yorda upon completing 2nd time through
Acquire spiked club
Acquire shining sword
Save at all save points
Beat the game within 4 hours
Beat the game within 2 hours
Clear the game without viewing a game over screen