Time allowed between each kill is only a couple of seconds, so two enemies have to be right next to each other for this to work.
If the enemy team is separated: You've got no -blam!-ing chance.
If the enemy team is grouped up: You need teammates by your side OR power ammo to take them on.
If you bring teammates: They can steal your kills and ruin it for you.
If you grab power ammo: You'll get killed by a Super before you get the chance to use it.
[b]Changes Needed:[/b]
1) Increase time allowed between each kill.
2) Make it so that you don't need to get the final kill.
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I always get it first game without trying so it's not impossible ^^ You can usually get one at the start of the game by tossing a nooba nade on the objective... What will help is to play in a team, because solo you get placed with retards that always do the opposite of what you expect such as flee 2v1 to their advantage and avoid capping objectives, if you'r dead from team incompetence it's harder to get the double kills.