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