Resistance 3
59 Achievements
20-25h
Grasshopper Unit
Kill 5 Longlegs in mid-jump
67.8%
How to unlock the Grasshopper Unit achievement in Resistance 3 - Definitive Guide
I found the easiest and quickest way to do this is tag one of them with your bullseyes secondary fire so that way you have homing bullets, then as he jumps just unload your bullseye with regular fire , so hopefully kill him mid air, I got this on my 5th Longleg and didn't miss a single jump kill.
This will be one of the first trophies you unlock. At the chapter Haven, OK: Junkyard Defense, you will first be introduced to Longlegs. The best way to do this is to tag a Longlegs when he lands using the Bullseye, wait for him to launch back up into the air, then begin to fire. Because the tag is still on him, all of your shots will go to him and he will die while in the middle of his jump.
Alternatively, you can shoot one with your Magnum, wait for him to launch back in to the air, then detonate the round. Simply do this for 5 Longlegs. Longlegs will continue to show up throughout the entire game, so you don't need to worry about farming this. You can track your progress through the Rewards section under the Extras menu.
Progress can be viewed in the rewards menu.