Dead Space 2
50 Achievements
1,000
20-25h
Lawnmower Man
Kill 4 enemies with the same Ripper blade
10
How to unlock the Lawnmower Man achievement in Dead Space 2 - Definitive Guide
It pops immediately after your fourth kill.
At the end of chapter 7, when the hub blows up the first enemies will be kids. I got the achievement there easily on Zealot difficulty without upgrading the weapon at all. Same method as IPooIPdog WoILf's one, just in another chapter, in case you missed this earlier.
I recommend using the Ripper's primary attack , which will extend a saw blade that hovers infront of you, on a group of weak enemies (preferably the The Pack) and quickly saw off their limbs with 1 Ripper Blade to unlock this.
Video by PowerPyx.
The schematic for the Ripper can be found in Chapter 5 behind the rotating orb that you must use stasis on to pull down the arms in order to shut it off and intiate Zero-G. Proceed to the next store and buy and equip it. Make sure not to replace the Line Gun as one of your weapons as you will shortly encounter a Lurker for Clean Cut. Once you make it into the main hall of the Church, after encountering two Lurkers, you will be attacked by a giant necromorph that tries stabbing you with a spike extending from it's mouth. After it climbs away, you will get attacked by a group of the Pack. Use the primary fire on them and continue holding down aim until the achievement pops.