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