For a surefire way to get married quickly, just read below:
So, get an amulet of Mara from the temple of Mara, in Riften, for 200 gold. Now wear this amulet, and go to Whiterun. There will be a woman NPC, that uses heavy armor, and a 2-H Sword in, or around the Bannered Mare Inn. Her name is Uthgerd the Unbroken. Now, this one is SUPER easy to get married to. All you have to do is challenge her to a brawl, for 100gold,beat her, and you win. You will now obtain 200 gold back for beating her in a brawl. She is now "available" due to the fact, you showed her how powerful you are. Talk to her, ask to marry while you are wearing your amulet of Mara, head to riften, tell the priest you want to get married, wait 24 hours, and attend your wedding ceremony. Your achievement will pop once you say "I do".
If you feel the need to vote negatively, please comment so I know why you did so.
*On a side note, this isnt a solution where I give you a massive list of NPC's that you can marry, when there is another solution dedicated to that. All I am doing, is telling you how to get married without all the much effort, persay like a quest you would need to do.*
*Has been edited for complete details*