For this acheivement you are going to need the perk Mortal Adoration which will give you the chance for one of your lovers to die instead of you during a murder attempt.
The easiest way I have found to do this is to play as Doux Leon of Thrakesion who is the holder of the Duchy of Thrakesion in the Byzantine Empire in 1066. He sometimes starts with a few perks in the Seducer Lifestyle and for speed it is worth restarting if he doesn't.
Start seducing any married women who are have Vengeful husbands. You can find them by bringing up the Character search by pressing C and searching for the Vengeful trait and filtering for Married Men.
Keep seducing, it doesnt matter if you get caught, in someways this will help and you may want to expose your secret. As soon as you have a few lovers and the Mortal Adoration perk fire your Spymaster and run at speed 5. Eventually someone will get annoyed with you and want you dead. Hopefully once they succeed at the scheme your lover will take your place.
Another route that I didn't have much success with is starting as Daurama Daura in 867 under The Great Adventurers. She starts with someone that wants her dead from the beginning but doesn't start with any perks in the seducer tree. I found I died before I could get the Mortal Adoration perk but your luck may be better.