Here is the full list of all 23 I Am The Hero (EU) trophies - there are 2 bronze, 13 silver, 7 gold and 1 platinum.
Defeat Dr.Litter
Defeat boss Butcher
Use critical attack 50 times
Find the AAA battery
Defeat boss Security
Find the weird part
Find the button battery
Find the frog
Find the minicontroller
Defeat boss Blah-blah
Find the tape
Find the sticker
Defeat Mr.Pro
Use critical attack 10 times
Find the car keys
Reach 100 combo
Get all trophies
Reach 200 combo
Defeat the final boss
Defeat the real final boss
Complete the story
Find the fist-gun
Find the Picture