Here is the full list of all 27 Super Dungeon Bros achievements.
Kill 5,000 wasps
Kill 7,500 bunnies
Kill 10,000 bonies
Kill five enemies with a pot
Complete a dungeon with each kind of weapon
Complete all missions
Play the game with every weapon
Play the game with every wand
You played the game with every crossbow
Play the game with every hammer
Play the game with every sword
Complete a dungeon without dying
Play the game wearing any helmet
Defeat Duke Spookem
Complete 10 missions
Have the top score in a 4 player online game
Complete all of a day's missions in one run
Defeat Frost Queen
Complete a dungeon with everyone having the same type of weapon
Defeat Cult Overlord
Kill an enemy with another bro
Beat a level before you reach threat level 3
Reach Duke Spookem for the first time with any weapon
Complete one mission
Throw all bros over a ledge in one game
Stay alive in threat level 5 for 30 sec
Be the only bro alive when everyone else died