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