I finished the campaign last night, putting me at 100.3% complete on campaign, 150% on multiplayer (prestiged once), and 20.4% on Special Ops, though I don’t remember actually playing it much.
If you’re looking for intel locations, check out this link.
These are the achievements you get for completing the story on Veteran:
As for other achievements, not relating to story, here you go:
This is My Boomstick (20). Kill 30 enemies with the XM25 in “Black Tuesday.” You have the XM25 as your secondary weapon starting out. Make sure you don’t trade it out for another weapon. Also, the gun has special operations that you can use, or you can just make sure you shoot the projectile into a wall or the floor where your target is. You can get a refill once you get to the Stock Exchange.
Strike! (20). Kill 5 enemies with 1 grenade in Single Player or Special Ops. In “Persona non grata,” you’ll start out in a room facing some large gates. It may take several tries, but try to toss a grenade at the doors just before it opens to catch the flood of enemies in the blast.
What Goes Up… (20). Destroy all the choppers with only the UGV’s grenade launcher in “Persona Non Grata.” There are six helicopters and each chopper takes two grenades to take down. You should probably only use the grenades on the chopper in case you miss.
Flight Attendant (20) Kill all 5 enemies during the zero-g sequence in “Turbulence.” Try to pick up at least one weapon with a decent number of bullets. The sequence happens when you enter the room with a large downward staircase, so if you see it coming, make sure your magazine is full.
For Whom the Shell Tolls (20) Destroy all targets during the mortar sequence with only 4 shells in “Back on the Grid.” Your first shot should be just outside the right wall of the building closest to you. Wait until the first truck stops at the building, and you will take it and the people out. That will help you not get shot, too. The second can hit the left tank when it stops, the the third takes out the last truck when it stops at the building. The hardest one for me (once I figured out where to put the first shot) was to get the people. Try to wait until they are grouped up inside the demolished building.
Kill Box (20) Kill 20 enemies with the Chopper Gunner in a single run in “Return to Sender.” The second run is supposed to be the easier one to do this in. Keep reloading the last checkpoint until you pop it.
Danger Close (20) Take down a chopper with an AC-130 smoke grenade in “Bag and Drag.” You get smoke grenades to mark your targets. Toss one under the helo that is dropping troops when you get to the courtyard. I actually got this one accidentally the first time. I was just trying to get the plane to kill a mass of people I saw- I was too busy trying not to get shot to notice that there was a helicopter!
Menage a Trois (20) Destroy 3 tanks with a single 105mm shot in “Iron Lady.” Soften them up with the smaller guns, then a little while into the sequence, a third tank will join the first two.
Nein (20) Kill 9 enemies with A-10 strafing runs in “Scorched Earth.” You’ll see a ton of enemies come out of the building next to the tank. After that, take out the ones behind the car, and clean up with others. If you’re too slow, your teammates will snipe enough of the enemies to not have 9 left, so just keep reloading the chekpoint. You do NOT have to do all 9 kills in one run. Also, long target lines seem to have no real value, since the bombs only go off in the first part anyway.