Full list of all 16 Spartan Fist achievements worth 1,000 gamerscore. It takes around 8-10 hours to unlock all of the achievements on Xbox One.
Used the Kitty Fist
Used the Rocket Fist
The Fixer thanks you for supporting the revolution
Used the Rat Fist
Used the Bear Fist
Used the Stone Fist
Used the Bandage Fist
Used the Feather Fist
... so hard he exploded
Complete the Concrete Wastelands
Complete the Underground
Complete Pigeon Paradise
Beat the Elevator
Buy 10 things from the Fixer
Buy 20 things from the Fixer
Buy everything from the Fixer