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