Complete Dead City Reverse in the Campaign

Kill an Authority Enforcer during Jetpack descent

Complete 2 missions for the Red Faction.

Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Complete The Well in the Campaign

Get 10 Headshot kills with the Sniper Rifle

Complete Dead City in the Campaign

Win a Race in the Campaign

Complete Ghost Hideout in the Campaign

Complete a campaign level cooperatively.

Kill 6 enemies in a row using a thermal weapon in Single Player or Special Ops.

Kill 2 rappelling enemies in a row before they land on their feet in Single Player or Special Ops.