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