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