Here is the full list of all 34 Huckleberry Falls achievements.
Beat level 10
Use 10 Strange Elixirs
Max all talents for a single hero
Break open every mystery crate
Purchase all trinkets
Beat level 35
Defeat the Lost Girl
Play all hidden sewer levels
Squish 1000 rats in the sewers
Kill 100 Fanatics
Unlock all survivors
Collect 500 Mushrooms
Get a gold skull on an Overrun level
Defeat Gorm the Destroyer
Beat level 50
Collect 10000 coins
Use Ice Storm 20 times
Beat level 85
Defeat the Executioner
Use Lightning Ball 20 times
Break open 100 power up jars
Score 100,000 points with a single combo
Absorb 5000 chaos souls
Rid of the world of 25,000 zombies
Use Acid Rain 3 times on a single level
Use 10 Molotov Cocktails
Defeat the Grand Summoner
Collect 60 skulls
Defeat the Gravediggers Master
Use Dark Tentacles 20 times
Use Meteor Shower 20 times
Collect 100 coin bags from curio rewards
Collect 100 gold skulls
Use Twisting Tornadoes 20 times