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