Torchlight III

Like the other kill achievements, this one is 1900 skelemans. I suggest traveling to The Witching Grounds, Lake Gobdunk, Goblin forest. The boss there Lily summons skeletons by the bucket, and the level leading up to her is 99% skeletons with a couple of netherbois. After you tire of skeleton grinding or kill Lily, exit to the main menu and do it again. Alternatively, you can just find a lily instance in the endgame Genie dungeon and farm skeletons there.

One HUGE thing I want to point out is that if you spam your attack button on Scout Bone, most of the time you will fire 2 volleys of 3 ratballs (at level 10), and they inflict twice the damage and debuffs. Remember this skill takes its damage from your weapon so make sure you have the highest ATK possible, and pieces that give +Scout Bone damage don't hurt. If you are lucky enough to find the legendary pistol Infections Shooter, you also get missles attached to the ratballs that do 50% weapon damage!

This worked, but I couldn’t get Sylvia to reset, even if I zoned out of the crypt. Perhaps a certain amount of time has to pass? Or the game has been patched to prevent this sort of thing? I ended up killing her every once in a while, quitting out to the main menu to reset the zone and just making another run.