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

Sun Tzu (20 points): Let your crew do the dirty work.
Fragile Alliance (10 points): Complete the first level in co-op.
No Going Back Now (30 points): Go to the point of no return in co-op.
End of the Road (50 points): Complete the game in co-op.
Impact (20 points): Escape from death row.
Damned if you do (20 points): Let them burn.
Damned if you don't (30 points): No rest for the wicked.
Iron Flower (50 points): Complete the game on hard.
Crowd Control (30 points): Surgical precision in the nightclub.
Have Gun, Will Travel Part I (20 points): Travel into the Rising Sun.
Have Gun, Will Travel Part II (20 points): Counter-revolution.
Have Gun, Will Travel Part III (20 points): The Beginning of the End.
Behemoth (10 points): Stop the roaring beast.
Pushblade Symphony (20 points): Points for getting up close and personal.
Frag Out (20 points): 5 with one fragmentation grenade.
Headmaster (10 points): 47 headshots.
By the Grace of.. (10 points): Lynch puts them out of their misery.
Boomstick (20 points): Shotgun messiah.
Return to Sender (10 points): Throw back enemy grenades.
Teflon (20 points): Avoid damage on a level.
Bulletproof (10 points): Avoid using adrenaline on a level.
Revenge Part I (20 points): Silencing the silent one.
Revenge Part IV (20 points): Shouldn't have gotten personal.
Revenge Part V (30 points): Glad it got personal.
Hindsight (10 points): Get that bird out of the sky.
Berserkopath (30 points): Make the most of Lynch's condition.
Bullseye (20 points): Lynch reacts fast at the Exchange.
Family Member (5 points): Complete a Fragile Alliance session.
Some (5 points): Escape with $50,000 from a Fragile Alliance heist.
A Lot (15 points): Escape with $1,500,000 from a Fragile Alliance heist.
Sweet Revenge (5 points): Get personal revenge in Fragile Alliance.
Crime Buster (10 points): Kill 10 traitors in Fragile Alliance.
Double Trouble (25 points): Kill 2 traitors in a Fragile Alliance round.
Never Give Up (30 points): Get 3 personal revenge kills in a Fragile Alliance session.
The Cleaner (30 points): Get 30 personal revenge kills in Fragile Alliance.
Mr. Popularity (35 points): Kill 100 traitors in Fragile Alliance.
Cash Addict (25 points): Help to get all the money out in a Fragile Alliance round.
Most Wanted (50 points): Escape with $150,000,000 from Fragile Alliance heists.
Mercenary (15 points): Complete one session in each Fragile Alliance scenario.
Mr. Play-It-Straight (50 points): Win 50 rounds of Fragile Alliance as a merc.
50 to Won (25 points): Win 50 rounds of Fragile Alliance.
Veteran (35 points): Complete 200 Fragile Alliance sessions.
Rush Hour (15 points): Escape in all rounds of a Fragile Alliance session.
Perfect Split (25 points): All players split the money equally from a Fragile Alliance heist.
Celebrity (0 points): Play as Lynch in Fragile Alliance.
True Elite (0 points): Play as Kane in Fragile Alliance.
Revenge Part II & III (20 points): Who's the old timer now?

The following achievements require the "The Dope Bag" bonus downloadable content:

Drug Lord (100 points): Complete a session on all four scenarios of The Dope Bag.
Front Runner (50 points): Escape with some Dope on the first helicopter on Flying High.
Ninja Looter (25 points): Loot katanas and nothing else and escape on Hooker's Trail.
Put it in your pipe... (50 points): At the beginning of the level Clean Cut look up to see a concrete cylinder hanging up by a crane, throw a grenade through it.
Steal from the Poor (25 points): Loot all five market stalls in Hasta La Vista.