Tooth and Nail
|Completed a level using only the nailgun.|
A level must be completed using only the Nailgun. The easiest level to do this on is the level with the TSD's where you have two soldiers, a regular marine and a Tech accompanying you. Also, all of the single player achievements are best done on the easiest difficulty, Private. This can be done before the TSD level, but you receive both upgrades before this level, so its much easier to do with the lock-on ability.
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