To get this achievement you have to reach 10 curse points (there is no way to check your curse, so you got to be counting how much curse you have been getting on your runs). There is plenty of ways to increase it:
1. Stealing stuff from any shops (1 curse per stolen item)
2. Buying from Cursula (The shop girl that you release from a cell, 2.5 curse per bought item plus whatever curse the item has)
3. Sitting on cursee pots (1 curse per pot after they break)
By far the easiest to get to 10 curse is to beat any character's past and then choose thet character again, pray at the altar that is at the starting room and that will set your curse to 9, then all you have to do is increase it by 1 point and you are done; beware though, at 10 curse the lord of the jammed will start to follow you around to every room and it can't be killed, plus almost every enemy will be jammed (double damage).