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