This Epic Dismemberment of 2500 Necromorph Limbs can be even accumulated until Chapter 13 in Round 1.
Stomp on the dead bodies' connected Limbs of Necromorphs - even those that you have found already dead.
Nine Limbs per certain type of body can be dismembered - it means, that almost 278 certain Necromorphs in a human-alike shape, would have to be completely destroyed. The fact is that the number of Necromorphs you have to dismember Limbs from is greater than this value, since you will encounter Necromorphs that are in different shapes, and a lesser amount of body parts can only be dismembered on those others.
To completely dismember a Necromorph, create an explosive impact on target creature - you may love to use the Contact Beam, or Hacker Contact Beam as you will succeed most efficiently. Stand in the middle and hit RB by using this ultimate weapon of destruction - wipe out the enemy that has crowded you - no longer you will be overwhelmed by these creatures of death and insanity. Fight back Terror with power!
Additional Information: Dismembering human corpses is irrelevant in order to accumulate Achievement progression. However, Infectors would be unable to transform human corpses into Necromorphs if they have been dismembered appropriately. The amount of Necromorphs is identical regardless to Round and Difficulty Setting. This Achievement's progression can only be accumulated in Single Player. It is relative to Save Game record, and can be continued by playing New Game+.