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