I have some problem with Cool Running achievement. I am certain that the firewall didnt touch any of my unit but i still fail to get the achievement.

Any idea what seems to be the problem?

Ok i will try it again to night. One more question, when it said unit, does it include building? Do i have to destroy say my refinery before the wall of fire burn it down?

Thanks.

Guys! Any hint on how to get the "Speed Too!" and "1 shot fifty kills" achievement?

"Speed too!" is a tough mission. Took me 50+ mins to complete it on my first hard try.

Thank you.

goldfries & alexwlh: Thanks for the suggestion dude! But I got a different approach with the "Speed Too!" achievement. All i did is spam marines, marines and more marines. At the same time, spam vikings to deal with those pesky mutas and broodlords.

I managed to complete the achievement around 23mins. The "One shot kills 50" is really easy as what goldfries have mentioned earlier.

Now i am struggling to get the achievement for the last mission. Any tips on how to hold the fort?

Yahoo!!! Managed to complete all the campaign achievement. I felt like i was cheating in "All in" where i basically wall off the artifact with supply depot in order to prevent the Zerg from destroying it.

I am off to tackle the Brutal difficulty