I'm not sure if there are other areas but it should be noted in the Roadmap that the
Kill 5 duskbats without touching the ground
Achievement is easily obtained during the Choking Grounds area. After the Stone Golem gives you the ability to see the portals, and you have to venture into the glowing seals, in one of them you have to achieve 30 instant kills. The area starts with four Duskbats hovering above.
Jump at the first one and press B to start your instant kill, then just as you are about to fall to the ground double jump to the next bat, and repeat. Try and stay near the circle in the middle of the area. When you get to the fourth bat be sure to move the camera around while killing him to see back to the circle area. Additional bats will drop in and you should easily be able to double jump to them for your fifth and final kill.