This guide will help you in earning the achievement "Stairway to Hell".
Stairway to Hell
So for this achievement I noticed that not that many people have gotten it so I decided to make a guide fully describing how to get the achievement.
It says "Kill 5 enemies while climbing a ladder", I personally thought it mean't that I had to kill people that are climbing a ladder, but it means that you have to kill 5 enemies while you are on a ladder. I achieved this by having people go on a ladder and then follow behind them and kill them from below while on the same ladder.
Hope this helps you out!