Mw2 style ingame achievements(sort of)

Can someone make a lua script that adds the mw2 achievement thingy on multiplayer?
For example Double kill(2 kills in 2 seconds)
Or Multikill(4 or more kills in 2 seconds)
Can someone do that?

Coding an exact one with animations will be difficult, but I do know one that simply highlights and announces the event when a player pulled off an accomplishment do in fact exists in many DM gamemodes.

Can you make it a addon, so any gamemode can use it?And does it work with npc’s and real players?