Here is the full list of all 28 Super Dungeon Bros trophies - there are 9 bronze, 12 silver, 6 gold and 1 platinum.
Collect all other SDB trophies
Play the game wearing any helmet
Kill 7,500 bunnies.
Kill 5,000 wasps.
Complete all missions.
Kill 10,000 bonies.
Play the game with every wand
Play the game with every weapon
Play the game with every hammer
Earn the top score in a 4 player game
Play the game with every sword
Play the game with every crossbow
Complete a dungeon with each kind of weapon.
Complete 10 missions.
Complete a dungeon with everyone having the same type of weapon.
Defeat the Cult Overlord.
Defeat the Ice Queen
Kill an enemy with another bro.
Complete the Three Daily Missions
Complete a dungeon without dying.
Defeat Duke Spookem
Be the only Bro alive when everyone died.
Throw all bros over a ledge in one game.
Reach Duke Spookem for the first time with any weapon
Complete your first mission in the game
Stay alive at maximum threat level for 30 sec.
Kill five enemies with a pot
Beat a level before you reach threat level 3.