Here is the full list of all 31 Iron Fisticle achievements.
Get the golden bananas
Collect all hint books
Collect 100 treasures
Collect 5 diamonds
Reach max level
Collect 1000 coins
Kill 10 enemies using dash
Get garlic breath
Make lemonade
Complete the game
Get the golden turd
Collect a giant piece of cake
Complete the third floor
Collect all rainbow gems
Collect all letters spelling B-O-N-U-S
Collect 10 golden goblets
Complete the second floor
Collect 100 items in the ledger
Complete The Graveyard
Complete the first floor
Buy a gold item in the shop
Complete the bonus game
Open 100 chests (any type)
Level up ten times
Kill 1000 Frankies
Complete The Catacombs
Complete a room without losing any health
Complete a room when entering with only 1 health
Complete the first room
Kill a golem
Level up once