*I do not earn the trophy in this video, as it randomly unlocked when I wasn't recording*

Equip the Rebar ammo for the Nailgun before attempting this trophy.

This can be earned pretty much in any mission. What you want to do is find and enemy that is in cover by a wall. Crouch by them and aim the Nailgun at their chest area or head. Hopefully the shot will pin there whole body to the wall or their head to the wall, either way the trophy / achievement will unlock shortly afterwards.

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