Fulfill your first request for Tessa. The first of many...
Build the roman theater
Build the roman theater in normal difficulty (or higher)
Build the roman theater in hard difficulty
Build the library
Build the library in normal difficulty (or higher)
Build the library in hard difficulty
Build the fortress
Build the fortress in normal difficulty (or higher)
Build the fortress in hard difficulty
Build the museum
Build the museum in normal difficulty (or higher)
Build the museum in hard difficulty
Reach day 200 without building the monument (normal difficulty or higher)