Incredibly easy to win on Emperor with Turks. The last 30 turns were just waiting for victory and with turns times I was bored (but wanted the achievement). It turns out the achievement for getting Constantinople is on Deity!. So the only achievement I got for my Emperor victory was for beating the scenario. This is what worked for me. Objective #1: Take Jerusalem and Mecca while building core cities in Levant (Eastern Mediterranean). Secure as much iron as possible. Make sure to build a good production port city to build caravels later. Aim for by 50 turns. Objective #2: Neutralize Saladin. This may or may not involve taking Cairo. I did and was building roads through Anatolia at a lightning pace. Raze a few of his cities. Aim for by 100 turns. Objective #3 (concurrently w/ #2). Secure naval supremacy of Aegean and Eastern Mediterranean. I found planting a city in the Aegean as a waystation to be incredibly helpful. Steal dromons to upgrade later to frigates. Objective #4: Take Constantinople and any key ports. Send caravels to the New World. By around turn 120. Objective #5: Neutralize Genghis Kahn and the Black Sea. Objective #6: Chew on Austria until victory. Social Policy: I took Liberty/Honor and part of Rationalism (to buy GS). My last SP was one point in Autocracy for the +1 happiness per city (or was it order?, whichever) Science: I beelined Universities then Navigation/Exploration then the bottom of the tree for UUs. I should try this on Deity for the achievement. But not for A LONG time considering how annoying the turn times were.