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