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