Lord Master of Great Skill
Get "Skill Level - Alien" in single player
30 
Pansy Worm
Mission 3 - Defeat the Panzer Wyrm (Coldstrike DLC required)
30 
Tough Stuff
Complete all missions on Hardcore Difficulty
20 
The Daily Grind
Get a character to max level in single player
20 
Mega Kill Combo
Get a 50x Damage Streak in single player
20 
Goody Two Shoes
Bring 20 Prisoners to the Church in single player
15 
Jonesing for Relics
Return all the Relics to the Museum in single player
15 
From Cold Dead Hands
Steal all Inferno's Weapon Crates in single player
15 
Supply Problems
Destroy all Mining Carts in the Kaabe Mountains
15 
Inferno's Briefs
Steal all the Document Briefs in single player
15 
A Mess of Stiff Staff Sergeants
Kill Inferno's Sergeants in single player
15 
Airborne
Pilot a helicopter in single player
10 
To Hell and Back
Complete Mission 9 on any Difficulty in single player
10 
Extraction
Mission 1 - Rescue all the civilians in single player (Coldstrike DLC required)
10 
Intelligence
Mission 2 - Acquire all intel on Coldstrike’s plans in single player (Coldstrike DLC Required)
10