This One Can Only Be Done As A Male Character, So It Requires Another 1/8th Playthrough To Get.
- Beating The Game Takes Way Longer, So Your First Playthrough Should Be A Female Character For All Other Various Achievements.
You Can Get Married As A Female Character, But You Will Not Be Able To "Elope", So This Achievement Stays Locked.
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As A Male Character: Get Married, Without The Family's Permission.
Conquer A Town Or Castle, Or Get Given One. (You Must Have A Fief)
- If You Are Friends With The King (+20 Reputation) He's More Likely To Give You Fiefs.
- You Can Attack An Enemy Lord, Then Come Back And Tell The King For +1 Rep.
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To Find Out Who's An Eligible Bride*, Talk To Poets And Bards. (Troubador, Wandering Skald, Wandering Ashik, Etc)
- Learn Poems From Wandering Poets (300g Each) To Tell To Your Love Intrests
You Need At Least 200 Renown To Get Into Feasts To Meet Your Chosen Lady.
How To Woo Your Love Interest
- Tell Her You Are Her Greatest Admirer To Start Courting Her.
- Tell Her Poetry, Visit Her When She Asks, Dedicate Tournaments To Her, Duel Her Other Suitors.
You Need At Least +20 Relationship With Her To Get Married,
- You Must Also Be In The Same Faction As Her Family.
Eventually When You Ask To Get Married, She May Agree And Say Her Family Doesn't Approve, If They Don't Like You.
- Don't Help Her Family At All, See Some Bandits Attacking Them? Ignore Him And Move On.
- Until You Get To +10 Relationship/Reputation With Them, They Still Don't Like You.
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Ask To Elope. (Requires Either 20 Relationship Points Or Relationship Points = 20 - 1 For Each Level Of Persuasion You Have.)
Achievement Unlocks When You Elope.
Good Luck!
Side Note*
"Ladies that are conventional or moralistic either require ridiculously high relations to elope, or won't do it at all from what I can tell. I had a conventional lady at 40 and couldn't elope, nor was I even given the option to pass a persuasion check. When I did it with a romantic lady, I was given the persuasion check at 14 relation. So just stick to romantic ladies..." - Credit Goes To Lvl 1 Blue Slime On TrueAchievements For This Tidbit.