Gathered 600 ADAM with Little Sisters

There are various ways to get ADAM. However, this particular trophy requires 600 ADAM that you remove from bodies with the help of Little Sisters. It does not matter how much ADAM you have; for this trophy, 600 ADAM should be total amount of ADAM removed from dead corpses by the Little Sisters. If you're aiming for the 'Dealt with Every Little Sister,' make sure you let the Little Sisters perform 2 Gathers each. You'll get this just before the last roaming Little Sister in the game so the opportunity window is very limited