To make certain Achievements very, very easy, set up a Firefight match with the exact settings below.

You can use this method for:

Set your Mission (Map) to Beachhead (you can do this anywhere but we found Beachhead to be the easiest to hit large packs of enemies)

Set your Difficulty to Legendary (for a score multiplier)

Under Game Options, choose Firefight Settings and Wave Properties and change these settings for Round 1, 2 AND 3 Round Properties. You have to change the settings for EACH ROUND.

After adjusting the settings and Skulls for ALL 3 ROUNDS, enter the Bonus Wave settings and make these changes.

Back out of the Wave Properties menu and make these settings in the Game Options/Firefight Settings menu.

Enter the Generator Properties menu and make the following changes.

Enter the Scenario Settings Menu and make the following changes.

You do not need to adjust the Custom Skull Settings. Back out to the Game Options Menu and choose Spartan Settings. Ignore the options here -- they won't matter -- and choose the Base Traits Menu.

Back out to the Spartan Settings / Base Traits Menu and choose Weapons and Damage and make the following changes.

Back out to the Spartan Settings / Base Traits Menu and choose Movement and make the following changes.

Back out to the Spartan Settings / Base Traits Menu and choose Sensors and make the following changes.

Back out to the Spartan Settings Menu and choose Loadouts and make the following changes:

Back out to the Firefight Menu -- you can ignore the Elite Settings and General Settings menus.

Now, begin your game.

Heat in the Pipe:

Since you are invulnerable and your rocket launcher will take out Elites in one hit, this just takes time. Your ultimate goal is to just hit clumps of Elites for high scores. After playing for a bit you'll learn the locations of Elite drops. Watch for the drop near the center of the map on the cement platform -- 8 Elites drop here at once! It took about 30 minutes and 750 kills for us to get 1,000,000 points.

Game Set Match:

Invulnerability helps with this a bit! Basically, kill every enemy in every round and wave until the rounds start over. This takes about 30 minutes. With the ultimate settings outlined above, you won't have any trouble with this -- but you'll have to have some patience!

Crowd Control:

The Killionaire medal can be won be killing 10 enemies within 4 seconds of each other. The easiest time to get this is during the Bonus round, where dozens...