1. Go to download database, there is a programe you can download which contains all sounds from Starcraft. Folow the instruction on how to install.
2.Go in your map.(Open it with starforge to get the sounds,then X-tra to do the triggers)
3. Do the trigger:
Condition: Current players kill score is at least 1 unit.
Action: Set kill score for current player to 0 units.
Action: Play Wav.
Avtion: Preserve Trigger.
4. Play your map, and enjoy the sound effects! 
5. Lower you skill level
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Finally someone post a trigger that would actually work. None of the other ones use kill score for the condition.