[Kahl Mission's challange] Please remove some specific trouble challange form Kahl mission

[LumilSilvermoon]

Since challenge on Kahl garrison was totally random form pull list, I found that some of them make it very trouble to do in some mission. One that i found it's very trouble is "To kill 10 enemy with Grenade" on Kahl Sabotage mission. The reason is, in this stage it's get very low enemy spawn. Before we alert them we encounter 5 total Moa. And we got not even enough start grenade to kill them all. It's very depend on luck to get more grenade. This week mission. I got only 2 granade more before encounter spider. Sneaky part i got only 1 form 5 Moa and during run to spider  i use satellite attack to kill many of them but it rarely drop grenade i got only 1 more. and while on this stage, we can't really hold up to keep farm grenade since we got chased by Daecon that can OTK us. And some time Grenade kill not count toward challenge with some reason. Grenade Kill is quite trouble since it depend on how enemy drop them. Other mission we can keep farming try and repeat. But this sabotage it's too trouble to do so. So please remove this challenge form sabotage mission.

And one more challenge that it's not suit to any mission is "Time attack" This one is very bad design. Most of other Kahl challenge make we need to spend time to explore, Kill with specific method, but time attack is design on the most opposite way. When we do Kahl mission we need to choose <Going for Time attack> or <Aim for other challenge>. Most of time it's very not possible to do both in same time. Only some lucky set of challenge that both can finish on the same time. But most of time it result for 2nd run. So please remove this Time attack challenge.