Here is the full list of all 12 Greed Corp achievements worth 200 gamerscore.
All lost harvesters were self-destructed, you had 1 or more each turn, and you were victorious
You fought and defeated your enemies one by one
You took everything you could possibly get from an enemy
Your cannons were able to strike anywhere on the map
You won before increasing your financial support
You won while never running out of time
Earn 9 titles
You travelled the world and conquered all your enemies
You defeated the enemy without going airborne
You fired a cannon for free at the one who lost it to you
A small island could not escape the destructive power of your harvester
You caused a chain reaction that reduced enemy presence