IIRC you need to install vulkan both for 32 and 64 bits at least for some Lutris stuff, so it might be a good start to verify that you have that.
On my system:
/usr/bin/vulkaninfo is owned by package vulkan-tools
/usr/lib64/libfluidsynth.so.3 is owned by fluidsynth-libs
I don't have the 32-bit version of either of those packages though, so that wasn't necessary for the games I've played at least. Can't remember if I installed them manually or if I got them through some metapackage.