Lol I got a similar achievement idea in another thread lol... Here's what I thought of:
"I just thought while I was playing c2c that achievements could be a possibility. I often try to break records with the amount of hammers or happiness in cities as well as the city size. So my idea was that once you get to a certain city size or hammer amount you get a money/gold reword which is higher if you complete a better achievement. Here are some examples:
City Size: (biggest city size)
Village: city size 5, reward: 500 gold
Town: city size 10, reward: 2,500 gold
City: city size 20, reward: 10,000 gold
Megalopolis: city size 40, reward 30,000 gold
State: city size 70, reward 150,000 gold
Country: city size 100, reward 750,000 gold
Continent: city size 150, reward 5,000,000
Planet: city size 200, reward 25,000,000
Solar system: city size 250, reward 100,000,000
Galaxy: city size 350, reward 1,000,000,000
Universe: city size 500, reward 20,000,000,000
Production: (hammers total in a single city)
Beginner workers: 5 Hammers, reward: 100 gold
Basic Team: 20 Hammers, reward: 500 gold
Confident Group: 50 hammers, reward: 2,500 gold
Professionals: 100 Hammers, reward: 10,000 gold
Machine Workers: 200 hammers, reward: 50,000 gold
Mass Production machines: 350 hammers, reward 150,000 gold
Cloning Machines: 600 hammers, reward 500,000 gold
Time Distortion Megafactory: 1,000 hammers, reward 2,500,000 gold
Obviously you could have achievements for any countable value in the game but I won't suggest more unless you like the idea..."
So what do you think... Knowing that those examples I gave were extremely hard to get because in my opinion nobody should every be able to get the last achievement of its kind lol