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