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