Currently, in my modpack i have Immersive engineering, but not tinkers orThaumcraft, so I get red stacktraces in console because it tries to load those two but is unable.

Please split it so there are three config options, one for each compatibility.

https://gist.github.com/ProsperCraft/7d06cd7538eaf1175e1c340f12f59d63

Pretty sure we can't control advancement loading conditionally

I am looking for a config that looks like this-

compat {
B:actuallyadditions=false
B:albedo=false
B:attaineddrops2=false
B:baubles=true
B:betterwithmods=false
B:bloodmagic=false
B:botania=false
B:chisel=true
B:chiselsandbits=false
B:cofhcore=true
B:crafttweaker=true
B:denseores=false
B:enderio=false
B:extrautils2=false
B:forestry=false
B:foundry=false
B:harvestcraft=false
B:ic2=true
B:inspirations=false
B:mysticalagriculture=false
B:opencomputers=false
B:railcraft=true
B:tconstruct=false
B:thaumcraft=false
B:theoneprobe=true
B:thermalfoundation=false
B:waila=false

Not this-

# Should TF Compatibility load? Turn off if TF's Compatibility is causing crashes or if not desired.
B:doCompat=true

Sure, but it still won't get rid of the errors in the log.

^

Adding config still won't fix the advancements failing due to nonexistence of mods, because advancements are much further out of our control. They exist as json files without conditional loading.

If it bothers so much, use CraftTweaker to remove the advancements.

I think the conversation went down a different path then I had hoped, I asked for a feature request to split out the compatibility, is that not going to be considered?

Even if we did that, that won't remove the console stacktraces.

Which is fine.