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