This mission has two acheivements Terran up the Sky and Apex Predator.
Terran up the Sky can be achieved within the first few minutes. After your primal leader knocks out the generator you will have a few minutes to do some damage. The achievement is to knock out 20 buildings before Drahara’s second attempt at knocking out a generation.
Start by attacking the southeastern base, it will offer little defense. After this is out spend your time trying to hit outlying buildings around the planetery fortress. Kerrigan’s nuke spell can be very useful in quickly dispelling enemies. Spawn banelings as always is very useful.
Once you are at 1:30 on the clock Kerrigan’s ultimate spell will pop up. Hopefully you went with Drop Pod. Drop Pod on top of the planetary and destroy it. You can just A+move north to clean up and you should be able to knock out 25-35 buildings by doing this. Be aggressive with Kerrigan’s spells as they will dispel buildings very quickly.
Accomplishing Apex Predator is not especially challenging. However note that the longer you take the more damage your units will take.
Drahka (the primal leader) in the first round will have a heal. If you feel like you will still die he can burrow and wait for his heal to come back up.
In the second round he gets a yank. This yank is far more useful than it is sold as. The pull ability not only pulls a unit to Drahka but it also happens to stun the unit. This makes it not only useful in these little engagements, but it also makes it useful later on when he joins the main army.
In the third round he gets a spawn primals ability. This ablilty allows him to call in two primals who can jump up like he can. In the third round you can actually skip over a lot of the fighting by jumping along the top. This also keeps Drahka safe from all of those evil things on the ground.
For the ground attack having an army composed largely of roaches and hydralisks will be very valuable. Note that on the main attack the psi destroyers will actually just out right destroy giant chunks of your army. So when it comes to this final engagement, it’s wise to right click all of your units on it.
Drahka is especially useful because he is not effected by it. As well since he can melee air units he can solo the final area.
Unfortunately just like Krukov, this is one awesome hero you will never see again.