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