Here is the full list of all 9 Tile Cities achievements.
Get to 500 points on any difficulty level
Connect 10 tram depots in a single network
Get to 100 points on any difficulty level
Fit a block perfectly among parks
Put that tile where it belongs
Get to 1000 points on any difficulty level
Get to 3000 points on any difficulty level
Don't leave your town
Build a square-shaped town of any decent size