I'm not very good at being "some kind of arachnid-man," so this is where and how I got the trophy. In the Festering Chasm, there's a large rotten tree in the middle of the area. It's called the Virulent Tree of K'Klenaii and there are large amber chunks and an Alien Alloy in there. Using the Blight Bombs to dissolve all the chunks, you'll be left with quite a few Big Ol' Nuts laying around. Grapple them all into the same rough area, then standing still, grapple the Big Ol' Nuts towards you until the trophy pops.