Ever since I got the Hat Trick achievement worth 33G, I’ve been really OCD about trying to even it out. I’m having trouble getting the One Man Army achievement. Does anybody have any tips on how to get this achievement the easiest way possible? I’ve been playing a lot of Ricochet on Pitfall, but every time I get the rocket launcher, I end up getting sniped straight away. I really want to get this achievement as soon as possible because it’s affecting my enjoyment of the game and making me play solely to get the achievement. I haven’t lost this much sleep since the You Blew It Up achievement in Reach.
Bring along the Ammo support upgrade and maybe Grenadier as well, and either Frags or Plasmas. Grenade the hell out of the Rocket spawn to chase off or kill off the enemy team, and then retreat back to your side of the map.
Don’t hang out in the open, or go chasing after enemies; let them come to you, and then blast 'em. Ammo will give you two extra rockets in case you waste a shot.
Really, this achievement isn’t supposed to be that hard; I got it on my first try, no sweat. It’ like shooting fish in a barrel.
I hate to say it, but I got this without even trying really. It was luck that I even got the Rocket Launcher because I usually don’t even go for it. It is almost always a guaranteed death for me when I do.
Anyway I would think Vertigo is the better map to get this. Don’t fret buddy…you’ll get it just have fun.
Thanks dude. Didn’t think about using the Ammo upgrade. Just got the achievement there, now I can rest easy 
And yeah, I realise it’s not a particularly difficult achievement, that’s what annoyed me that I couldn’t get it 
i didnt even know this was an achievement til after i already got it. very first game. real easy. as soon as you get rockets just camp the middle hallways.
There wasn’t really anything to it for me. I just rushed for the rocket launcher and ran around shooting people with it. The team I was playing against was really easy though so I guess it’s just a matter of getting a lucky start.