After updating/refreshing mirrors an extra -y need to be passed to pacman command. Did you do that already?
sudo pacman -Syyu
Yes, I did pacman -Syyuu first, which showed no updates then tried pacman -Syu just to check
[root@CogenT440p pacman.d]# pacman -Syyuu
:: Synchronizing package databasesā¦
core 131.0 KiB 784 KiB/s 00:00 [--------------------------------------------------------------------] 100%
extra 1598.2 KiB 794 KiB/s 00:02 [--------------------------------------------------------------------] 100%
community 5.5 MiB 568 KiB/s 00:10 [--------------------------------------------------------------------] 100%
multilib 149.4 KiB 799 KiB/s 00:00 [--------------------------------------------------------------------] 100%
endeavouros 17.3 KiB 237 KiB/s 00:00 [--------------------------------------------------------------------] 100%
herecura 69.1 KiB 646 KiB/s 00:00 [--------------------------------------------------------------------] 100%
:: Starting full system upgradeā¦
there is nothing to do
[root@CogenT440p pacman.d]# nano mirrorlist
[root@CogenT440p pacman.d]# pacman -Syu
:: Synchronizing package databasesā¦
core is up to date
extra is up to date
community is up to date
multilib is up to date
endeavouros is up to date
herecura is up to date
:: Starting full system upgradeā¦
there is nothing to do
open welcome app and choose āupdate mirrorsā 
Perhaps you could regenerate the mirrors and this time rank them by the time they have been synced.
For example:
Server = http://mirror.metalgamer.eu/archlinux/$repo/os/$arch
seems to be out of sync as of the time of this post according to:
https://archlinux.org/mirrors/status/
I didnāt check the others.
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Yeah that fixed it, 1500Mb of updates Iāve missed 
Total Download Size: 1586.31 MiB
Total Installed Size: 5338.84 MiB
Net Upgrade Size: -114.28 MiB
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