Complete the indicated task to unlock the achievement.

Achievement	How to unlock
6 million eyes	Created a population over 3 million.
Building Blocks	Unlocked 5 buildings over Lv.10.
Buzzing	Unlocked over 15 characters.
DRAGON CLASS	Unknown.
EAGLE CLASS	Unknown.
First City Built	Built a city for the first time.
Good company	Unlocked 5 characters.
Long live the mayor	Over 300 years passed.
Metropolis	Unlocked 10 buildings over Lv.10.
Overachiever	Made a block of Lv.25 and above.
Skyscraper	Created a block of Lv.15 and above.
Utopia	Unlocked 15 buildings over Lv.10.