Here is the full list of all 12 Siren trophies - there are 7 bronze, 4 silver and 1 gold.
Hit the Police Officer with the truck at the construction site.
Free the Kiruden from the lanterns.
Play Time Attack.
Play the Brain Cell Revival game.
Reach the road to Hirasakai in under 55 seconds as Kei Makino.
Collect 50 archive items.
Complete all Day 1 mission objectives.
Unlock Stage Select.
Use the umbrella to incapacitate Mina Onda with some help from a fire extinguisher.
Complete all Day 2 mission objectives.
Collect all archive items.
Decapitate Datatsushi with the Homuranagi.