Aragami: Shadow Edition

To get the Up and Down achievement all you need to do is shadow leap above someone, your target circle will change from blue to red, then when you teleport you'll automatically drop down and kill them. I did this inside of a building in Chapter 4, though I'm sure there are many locations to get this achievement.

Note: I think that you need the ledge kill skill to get this to work, but I don't know for sure.