Smash and Grab - Hit & Run Achievement

So I'm playing the campaign again on hard difficulty, with the aim of getting all of the mission-related achievements. Recently I've hit a bump with the Hit & Run achievement in the Smash and Grab mission.

I usually start out by sending four of the five starting SCVs to mine minerals, send one to build a Bunker at the ramp, and use my remaining 50 minerals to produce a fourth marine before sending them into the bunker. I place the Medic with the Marauders Swann gives me, and procede to destroy the first two Pylons down the path to the Artifact, luring enemy units back to my Bunker if things get too hot.

I don't really have a set plan after that - I just build another Barracks with a Reactor and pump out the biggest mix of MMM I can, building Supply Depots when needed and calling down one or two War Pig squads when money permits. I roll through the Protoss defenses as fast as I can; the only time I stop to destroy more than just Pylons is in the base immediately before the Artifact, so I don't have to deal with constantly spawning Zealots/Stalkers and Probes that keep replacing whatever I destroy. In spite of this, the fastest time I've been able to muster is 15:47, and I'm at a loss as to how to cut down that time.

 

Have at least 2 barracks with tech labs and more marauders than marines. No bunker needed, set rally point to the ramp, and have your main army consist of about 4 marines, 10 marauders, 4 medics, and it's done, but be sure to start going before you have those numbers. Can't remember my time though.

 

I have done it once and had a time of 12 mins of so.

I think the best way to go is build a bunker for the incoming zerg,and get your first MMM group to destroy the early protoss fortifications really fast,strengthening it continuously with more units.I would suggest sticking to the left and progress ignoring most protoss buildings.

 

Wow, that made all the difference! The only marines I had in my squad was a single troop of War Pigs, the rest was a 12 Marauders and 8 Medics. I still destroyed the Nexus along with the Pylons, but I left the rest of the buildings where they stood. Final time of 12:58