Here is the full list of all 20 Tokyo 42 trophies - there are 4 bronze, 7 silver, 8 gold and 1 platinum.
Act 1 completed
Get a grenade through the hoop
Kill three enemies with one grenade
Kill yourself with a grenade
Complete Intro
Wow. All the trophies? That is serious commitment! You may now demand that people refer to you as "Master of Assassins".
Complete Act 2
Complete the story
Complete the bike race
Reach highest level in copdrop
Complete all missions and get all collectables
Unlock all secret portals
Collect all the weapons
Collect all cat skins
Collect all coats
Collect all cash drops
Find all Tokyo Tourism sights
Complete all ninja missions
Complete all ronin missions
Complete all roninja missions