Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Campaign Completed (Easy) (50 points): Complete campaign mode with any combination of single player and co-op on Easy difficulty.
Campaign Completed (Normal) (75 points): Complete campaign mode with any combination of single player and co-op on Normal difficulty.
Campaign Completed (Hard) (100 points): Complete campaign mode with any combination of single player and co-op on Hard difficulty.
Campaign Completed (Extreme) (150 points): Complete campaign mode with any combination of single player and co-op on Extreme difficulty.
Lang Time Dead (20 points): Complete any campaign or co-op mission with at least 50 kills and 30% accuracy using Lang.
Graves Digger (20 points): Complete any mission with at least 50 kills and 40% accuracy using Graves.
Ain't Got Time To Bleed (20 points): Complete any Campaign or Co-op mission without going MIA (no loads or checkpoint resumes allowed).
Kill Streak (20 points): Score 50 kills in a row without going MIA.
Splash Damage (20 points): Achieve 10 grenade kills in one mission.
Brawler (20 points): Achieve 10 melee kills in one single player or co-op mission.
Minute Man (20 points): Destroy 45 objects in 60 seconds.
Scorched Earth (20 points): Destroy at least 75% of destroyable objects in a mission.
Collateral Damage (20 points): Make 10 indirect kills in a mission by shooting explosive objects such as barrels or gas cylinders.
One Careful Owner (10 points): Ensure BMP survives until the end of Monastery.
Saving Private Yelkin (10 points): Ensure Private Yelkin survives in Whaling Station.
Easy Slider (10 points): Commandeer hovercraft and ensure it survives to perimeter wall in Submarine Facility.
Vertically Challenged (10 points): Destroy Jump-Jet in Submarine Facility.
Defend The Doctor (10 points): Ensure Dr. Pessich survives until end of Castle.
Compound Problem (10 points): Escape from police compound without going MIA in Township.
Police Protection (10 points): Save RPF troops in town square in Township.
Search And Rescue (10 points): Rescue Bishop Three in Township.
Your Cousin Dances Naked... (10 points): Listen in on 4 guard conversations in Diamond Mine without being detected.
Out Of Sight (10 points): Track Atongwe in Diamond Mine without being detected.
Prisoner Release Programme (10 points): Ensure FSB Agents survive until the end of Castle.
Change Of Priority (10 points): Ensure hostages survive on Tanker.
Deal Breaker (10 points): Track down and kill Kwennoir in Sawmill.
Curse Of The Bambino (10 points): Rescue Foley in Sawmill.
Delta Force Stay The Course (10 points): Ensure all Delta Force members survive until the end of Oil Refinery.
Gas Tap (10 points): Prevent gas from being released in Military Base.
Co-operative Mission (15 points): Complete any mission in Co-op.
Co-operative Campaign (30 points): Complete a full campaign in Co-op.
Perfect Partner (20 points): Complete a Co-op mission without either player going MIA.
Top Of The Pile (20 points): Finish first in a Deathmatch Ranked Match with 16 players.
Deathmatch Dominator (20 points): Win a Deathmatch Ranked match, scoring double the kills of your nearest rival.
Deathmatch Killing Streak (20 points): Score 15 consecutive kills in a Deathmatch Ranked match.
Won Deathmatch With Lang (10 points): Win a Deathmatch Ranked match playing only as Lang.
Won Deathmatch With Graves (10 points): Win a Deathmatch Ranked match playing only as Graves.
Carrying The Team (20 points): Score over 50% of a winning team's points in a Team Deathmatch Ranked Match.
Team Deathmatch Killing Streak (20 points): Score 15 consecutive kills for a single team in a Team Deathmatch Ranked Match (Any weapon).
Won Team Deathmatch With Lang (10 points): Win a Team Deathmatch Ranked match playing only as Lang.
Won Team Deathmatch With Graves (10 points): Win a Team Deathmatch Ranked match playing only as Graves.
Clean Sweep (50 points): Hold all 5 flags for at least 30 seconds in a Conquest Ranked match.
Conquest Conquerors (20 points): Score double the other team's points in a Conquest Ranked match.
Healing Hands (10 points): Heal 10 team members in a Conquest Ranked match.