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