How to get Domination achievement easier

There are six medals that count towards the Domination achievement, those are:
Killionaire - 10 kills within 3 or 3.5 seconds of each other.

Perfection - win a slayer game without dying with 15 or more kills.

Triple Double - finish a game with double digit kills, assists, and headshots.*

Steaktacular - Win a slayer game by 20 or more points.

Unfrigginbelievable - a spree of 40 kills.

Extermination - wipe out an enemy team with at least an overkill.

In my opinion the easiest medal is the Steaktacular one. Mostly because you can consistently get it as long as you and your team are kinda good. You can also go for the Extermination medal at the same time since in Halo: CE enemies spawn near eachother mostly and grenades can kill them easily. And in SWAT you can kill all enemies with four shots rapidly.

The easiest game for this is Halo CE, mostly becuase I've read that Steaktacular only works in Halo: CE and Halo: 2A. And the gamemodes you choose should be 4v4, SWAT and Precision Slayer. Both have the Magnum and can kill enemies pretty easily. Also use grenades alot.

I got the Steaktacular medal around every other game I played, sometimes I had bad luck and ended up with a team who wasn't very good and opponents who slaughtered us, but I also got matches where some enemies left and made it a 4v2 or 4v1, which made things alot easier.

This is how I got the achievement, good luck!