ClingyG 25

Not a hard achievement at all. I tried this Achievement on level one and for some reason it won't unlock. I tried multiple times on level one and nothing. So here's what you do.
1. Once you beat the game, go to chapter selection.
2. Select 11th hour
3. Set to Easy (achievement says any difficulty)
4. Once you start the mission run foward and Enviro. kill the
guy working on the truck
5. Now proceed through the maze of trucks grapple killing people as you go
6. Don't shoot anyone, not even the people shooting at you in the rafters, otherwise it will reset.
7. Using people as a meat shield will also reset the grapple kills, so make sure you press up on your D+Pad for every kill.
8. You may have to flee every now and again to let your health regenerate.
9. In the vehicle hanger there should be about 20-21 guys you are able to grapple, so you should have no problem getting this achievement.