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