There’s a few things to watch out for.
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Any Auto Turrets that are dropped by Ravens must not be present when you kill Narud. Because they count as structures, they will fail the achievement. Due to their darker color palette and being under void clouds, they are very easy to miss in the two upper corner bases.
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When you move in to kill Narud, leave something of the enemy alive before killing him. When his HP bottoms out, immediately kill something else in the split second before the mission ends.
Here’s a vid I made for players and Bliz that shows what I think the problem is. If you want to skip right to the demonstration part, fast forward to 6:50.
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When you move into Narud’s base, get things doen quickly. The destroyed rifts there will respawn after a bit of time (quicker the harder the difficulty) and their appearance in that split second at the end can fail the achievement.
The Rifts in the first stage don’t count and neither do the gas pickups so you don’t have to worry about them if you don’t want.