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