Two for One- Go on Valhalla get the Spartan Laser and as guys are going off the lift laser two of them at once.
Too Close to the Sun- Just get the missile pod or Spartan laser and take out a banshee. Probably one of the easiest ones to get haha.
Mongoose Mowdown- Get on of your teammates to distract someone on the other team in the middle of the map and hit them with the mongoose at a 90 degree angle.
Triple Kill- Go on narrows get the bubble shield; deploy it in the middle of the bridge. Be sure to have the rocket launcher and mauler. Wait for them to rush you and let them come into the shield beat them down with the mauler and use the rocket launcher to get easy kills.
Overkill- Use the S’s sniper, sword, sticky (nades), Spartan (laser), and shotgun.
Steppin Razor- Get the sword and go in a bubble shield and wait for the idiots to run in.
Headshot Honcho- Get the battle rifle and simply spray at there heads.
Used Car Salesman- Try doing it in campaign (easy), or get stealth, plasmas, and find them in a warthog.
Killing Frenzy- Get the weapon you are best with and run like a mad man.
Always be in a small group that you will be able to live in and still get kills off of.
Lee R Wilson Memorial- Pick up a crap load of plasmas and use the shotgun method to stick them (get as close to them as possible and just stick it directly to there body).
We’re in for some Chop- Just destroy an enemy vehicle with equipment with a plasma or rocket launcher etc.
Maybe Next Time Buddy- Get in a warthog, slow down, and purposely let another player steal your vehicle, then rush them and get back in. They should be going slow since you purposely slowed down.