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