Kill 4 enemies with a shotgun in 10 seconds or less. (campaign only)
I found this one easiest to be done at the beginning of Chapter 6, when you become stranded. Go over to the right hand side from your start point to find grenades and a shotgun. Proceed down this hallway, and you should have just flanked 4 enemies, with a shotgun in your hands at a very close range. Kill them all to unlock the achievement.
If you are having trouble using the above method, just keep at it, and use the shotgun in close quarter combat situations when enemies are running towards you, and you can always try to try the difficulty down.
In chapter 2, before they drop C4 from the roof. When the checkpoint loads run up the stairs and stand with your back to the set of big doors. Start shooting the guys as the come from above. Should pop easily.
Chapter 5 in the beginning. Take out the first 2 guys on the stairwell with a silenced weapon and proceed down the stairs. Take out the next 3 guys in this room and this should trigger an alarm. After than about 4-8 guys come running up the stairwell. Easy pickins with a shotgun. Died on suicide difficulty and reloaded and got my grenade achievement here too
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