ACHIEVEMENT - HOW TO UNLOCK
A Mess of Stiff Staff Sergeants - Kill Inferno's Sergeants in single player
Airborne - Pilot a helicopter in single player
Extraction - Mission 1 - Rescue all the civilians in single player (Coldstrike DLC required)
From Cold Dead Hands - Steal all Inferno's Weapon Crates in single player
Goody Two Shoes - Bring 20 Prisoners to the Church in single player
Inferno's Briefs - Steal all the Document Briefs in single player
Intelligence - Mission 2 - Acquire all intel on Coldstrike’s plans in single player (Coldstrike DLC Required)
Jonesing for Relics - Return all the Relics to the Museum in single player
Lord Master of Great Skill - Get "skill level - alien" in single player
Mega Kill Combo - Get a 50x Damage Streak in single player
Naughty or Nice - Receive a present from Santa Claus
Pansy Worm - Mission 3 - Defeat the Panzer Wyrm (Coldstrike DLC required)
Supply Problems - Destroy all Mining Carts in the Kaabe Mountains in single player
The Daily Grind - Get a character to max level
To Hell and Back - Complete Mission 9 on any Difficulty in single player
Tough Stuff - Complete all missions on Hardcore Difficulty

"Coldstrike Campaign Pack" achievements
ACHIEVEMENT: HOW TO UNLOCK
Extraction - Mission 1: Rescue all the civilians in single player.
Intelligence - Mission 2: Acquire all intel on Coldstrike’s plans in single player.
Pansy Worm - Mission 3: Defeat the Panzer Wyrm.