A quick way to grind out this achievement is to complete the initial 6 Levels. This will unlock 3 Experimental Levels including one titled "House of Knives". This is the level that will speed up an already quick completion.
In the level there are 2 giant sized knives that will instantly kill the burglars. The first one is in the bedroom at the back of the house and the second is in the bathroom (the one not adjacent to the aforementioned bedroom).
Suck up the giant knife, press
to hold it, and then move into an enemy to kill them instantly. It's important to note, in order for the kill to count you need to suck up the corpse afterwards. Simply reset the level and repeat the steps until the achievement unlocks.