* indicates what I've won so far
Easy (if anything is easy for Emperor):
*Netherlands (land grab)
*Khmer (patience)
*Germany (thank God for the Internet--beeline computers)
*England (really need to get pacifism early for great scientists and merchants--all bulbs and hope you don't get a great spy by mistake)
*Russia (had a completely peaceful game with Germany as my friend! and thank God for the $1 cost research for a lot of earlier techs)
*Rome (need lots of military to defend against barbarians)
*Mongolia (building lots and lots settlers)
*France (capture Milan and Rome straight away, beeline for Engineering, Democracy and Radio; plant some great spies in civs with these techs to sabotage their production; give all your American cities to America)
*Spain (Compass-Optics-Calendar-Astronomy; capture Rome; collapse France early: the rest is history. Make sure you have enough troops in Incan and Aztec land towards the end in case they revolt and crush them)
*Inca (don't go for Optics but cap research at 0% after calendar)
*Viking (found city by whipping an Incan city for a settler, capture Rome ASAP and build lots of caravels)
*Japan (600AD) (Keijo, Hangzhou and Guangzhou need to be captured before anything else is done; need 1-2 vassals, circumnavigation and liberalism; then it's turtle time)
*Portugal (3000BC start) (just keep Spain happy)
Possible but hard and need luck and perseverance:
Portugal (600 AD) (opening borders is very hard in emperor and 11 civs in 600 AD is almost impossible compared to 3000BC)
*Egypt (really need luck, have tried 12 times, each time beat by AI for Great Library until Greece decided to go for the Parthenon instead)
*Carthage (collapse Egypt first, then Greece, then Babylon; build Great Lighthouse and Colossus to take care of economy)
*Arabia (can't get to gunpowder in time for cannons, you'll get gunpowder just around 1250 when Spain should have been collapsed already; tons of barbarians)
*Aztec (land grab)
*China (600AD) (chop and whip, and build 2 cathedrals in Beijing, 1 in Hancheng, and one in Guiyang)
*Turkey (Arabia is very advanced when you spawn; the 3000BC start is doable, having more vassals to choose from)
Impossible starting without cheating (because of tech requirements):
*Greece (with the Indian genocide/Babylonian migration technique)
*Persia (can't get to math and currency in time, no great wall; but you can cheat starting with Hammy)
*Ethiopia (unless you happen to have a great Egyptian prophet flip in your territory--see my cheat method below starting as Egypt first)
*Mali (the population is so much unhappier to whip, and nobody will freaking open borders!! 1900 gold, which used to be enough for Monarch, is no longer enough for the 1st criteria, even 3500 gold isn't enough. However, since France is first in gold usually, you can cheat by starting as France and capturing Rome ASAP)
*Japan (3000BC) (China is too powerful when you spawn, and no free cities in Korea and on the coast; Rome will still be alive in 1500 most likely, though India and Babylon are likely to be dead and not of concern; however, starting as China and sending 2 settlers to Japan to jump start is doable; need to not overbuild cities to avoid 0% science, and Colossus, Moai Statues and Great Lighthouse need to be built ASAP)
America (riflemen just don't do well against infantry in 1740, and democracy is so damn expensive; most likely the Statue, UN and Pentagon are already built by China or another advanced Western civ like France; Usi's idea is to kill all Eurasian civs with Arabia and then give everything to America, including all your productive European cities)
Impossible (with or without cheating):
India (founding 2 religions is lucky, 5 is impossible)
Babylon (no Oracle so no free tech, you get beat to writing by China every time)
China (3000BC) (cannot found religions)
Maya (the Temple of impossibility, since the computer favors military wonders like Great Wall, Colosseum and Temple of Kukulkan, almost always built by China or Rome around 300-400 AD; getting to Calendar in 600AD is scientifically impossible currently (best I did was 3 moves short))
Did I miss anything?