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