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