Defeat the Vaal Omnitect challenges

Please, give me some light here with:

- Defeat the Vaal Omnitect after defeating waves of Experimented Hatchlings.
- Defeat the Vaal Omnitect after defeating the two Omnitect's Guard.

I made Hybridisation Chamber for minions.
I used my jugger to kill as slow as possible (so I will not miss any Hatchlings) and still - It did not count.

I have killed dozens of times Omnitect's Guard and again - nothing.

I must be doing something wrong.

Thx

same here... i can't seem to get the achivement at all..

I treid 3 times,

slowly lower the omnitect hp to 50%, then killed 2 guards, hatchlings, and then the omnitech. But i still don't get the achivement...