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