Choose scout, Hide behind the hill at enemy spawn point, close but out of sight.
Wait until enemy has a gift and is running back to base. This may take some time.
Once they are at top of hill but not too close to there base, hit cloak...run towards target carrying gift, at this point he will have no bodyguards as they will think he is safe and run past his team mates, hit sniper shot while cloaked with full charged, this will nuke him to 10-20% health, then spam every you have that does alot of damage at point blank range.
Don't be surprised if you get called exploiter or hacker after you pretty much one shot them in a second and stop them scoring. It pissed them off alot.
He dies, you get achievement point, you stop enemy team from scoring. Everyone wins
Thats how I got mine anyway. repeat and rinse.
The funniest thing was noone caught onto what I was doing, so I would just cloak back up and hide behind the same hill again right next to there spawn. Basically meant there was no chance of them ever scoring a point.
Edited by Eon Lilu, 17 December 2012 - 09:10 PM.