Call of Duty: Modern Warfare 2/Equipment Challenges

Challenge	Rank Unlocked	Requirements	XP	Title	Emblem	Tactics
Darkbringer	4	Prevent 25 Tactical Insertions.	1,000			Use SitRep to look for Tactical Insertions and instead of camping for an enemy to re-spawn, destroy the Insertion, this can be hard as not many people use these.
Tactical Deletion	4	Kill 25 players that spawn using Tactical Insertion.	1,000			Use SitRep to look for Tactical Insertions and wait for the enemy to re-spawn.
Grenade Kill: I	4	Kill 10 enemies with grenades.	500		N/A	Use Danger Close to make Grenades more powerful to help you achieve this, Scavenger is also a good idea a it means you can pick up grenades after you've used this. Alternately, One Man Army will also allow you to replace your grenades without having to risk searching around near dead bodies.
Grenade Kill: II	4	Kill 25 enemies with grenades.	2,500		N/A	〃
Grenade Kill: III	4	Kill 50 enemies with grenades.	5,000	N/A		〃
Plastered: I	4	Stick 5 players with a Semtex grenade.	500		N/A	Equip Semtex and possibly a Heartbeat Sensor, as it's fairly hard to find anyone standing still to stick the grenade to, find enemies camping and instead of knifing them or getting a headshot, throw the grenade at them.
Plastered: II	4	Stick 15 players with a Semtex grenade.	2,500		N/A	〃
Plastered: III	4	Stick 30 players with a Semtex grenade.	5,000	N/A		〃
Carnie: I		Kill 5 players with a Throwing Knife.	500		N/A	Equip a Throwing Knife and possibly a Heartbeat Sensor, as it's fairly hard to find anyone standing still to kill, find enemies camping and instead of knifing them or getting a headshot, throw the knife at them. You could also throw the knife when anyone comes to knife you in normal gameplay and hope for the best.
Carnie: II		Kill 15 players with a Throwing Knife.	2,500		N/A	〃
Carnie: III		Kill 30 players with a Throwing Knife.	5,000	N/A		〃
It's Personal!		Hurt an enemy then finish them with a Throwing Knife.	1,000			Find a camping enemy, shoot a few bullets at them then throw the knife, or use the riot shield and hit them once and then throw the knife from up close for a good chance at hitting.
Did You See That?		Kill someone with a Throwing Knife while flashed or stunned.	1,000			If you find a camping enemy, you can stun yourself to get this challenge although you are more likely to miss. You can also try to kill someone blindly when you are flashed in an open area.
Claymore Shot: I		Kill 5 enemies with Claymores.	500		N/A	Plant Claymores around corners and use Danger Close and you will eventually get this, you could also use SitRep. Find an enemy claymore and kill them by shooting it.
Claymore Shot: II		Kill 15 enemies with Claymores.	2,500		N/A	〃
Claymore Shot: III		Kill 30 enemies with Claymores.	5,000	N/A		〃
Jack-in-the-Box: I		Kill an enemy within 5 seconds of tactically inserting, 10 times.	500		N/A	Use SitRep to look for Tactical Insertions and wait for the enemy to re-spawn.
Jack-in-the-Box: II		Kill an enemy within 5 seconds of tactically inserting, 25 times.	2,500		N/A	〃
Jack-in-the-Box: III		Kill an enemy within 5 seconds of tactically inserting, 50 times.	5,000	N/A		〃
Solid Steel: I		Survive 10 explosions while using Blast Shield.	500		N/A	Use Blast Shield when a grenade comes near you, this may be a good idea when you are using a Riot Shield. You can also "boost" for this by simply blowing up cars, explosive barrels, helium tanks, etc. and just be close enough with the Blast Shield equipped so it hurts you but does not kill you.
Solid Steel: II		Survive 25 explosions while using Blast Shield.	2,500		N/A	〃
Solid Steel: III		Survive 50 explosions while using Blast Shield.	5,000	N/A		〃
C4 Shot: I		Kill 5 enemies by using C4.	500		N/A	Use C4 and Danger Close, throw C4 into windows and kill people, or camp and use it. You could also use SitRep. Find an enemy C4 and kill them by shooting it.
C4 Shot: II		Kill 15 enemies by using C4.	2,500		N/A	〃
C4 Shot: III		Kill 30 enemies by using C4.	5,000	N/A		〃