To get all of these in a single playthrough, you will need to make sure you save your game at levels 7, 13 and 19 and do all three of them before moving on and before saving over your old save file. Also be sure to save a side-quest or main quest for just before reaching each of the required levels to make it easier.
I would suggest being good at first. Getting bad karma is the easiest, so staying good the entire game will make it easier to handle these. Get your achievement for good, then reload your save. Go on a murder spree until you hit neutral, then turn in your quest to reach your target level. Reload your save yet again. Go on an even bigger murder spree until you hit bad, then turn in your quest to reach the target level. Repeat this process for each set of achievements.
Note: See "Silver-tongued Devil" for a few infinite speech challenge loops. You will gain experience for every speech challenge won, so these will also aid in getting to the level you need without messing up your karma situation.