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