Here is the full list of all 9 Spartan Fist achievements.
Optimouse and Prat both think you're pretty cool
You have achieved the respect of Meow Max
So hard they exploded...
Gurren Pigeonn has a newfound respect for bread tossers
You've taken the measure of yourself, and found it wanting.
The Fixer thanks you for supporting the revolution
The Fixer explains how big an impact you've had on the revolution
The Fixer gives you a tour of the training camps you've funded
Welcome to the resistance. The revolution will not be televised.