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