Here is the full list of all 13 Wondershot trophies - there are 9 bronze, 3 silver and 1 gold.
Get a Gold medal in one of the Endless modes
Complete 500 Brawls
Complete all Challenges
Defeat 3000 monsters
Applause 20 times during a Replay
Complete 50 Brawls
Own all the bonuses at the same time
Own all the Perfect medals in a chapter
Own all the Dev medals in a chapter
Complete a Survival challenge without defeating any monster
Win a round without shooting
Defeat a Whoorun with the Sneaky, Portal Kill and Ruthless mentions
Reach a x50 combo in one of the Endless modes