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Please post the journal for the last working boot and the contents of /var/log/pacman.log, see the tip box from pastebin to pipe the output straight to a pastebin.
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I think microcode might be needed, since it fixes things with cpus. So it's probably better put it back.
For AMD processors, install the amd-ucode package.
For Intel processors, install the intel-ucode package.
After that, of course bootloader should be refreshed, if install does not do it. Then reboot. Look ArchWiki microcode page for details.
I did that but still nothing.
So I'm trying to do an other install of arch on the machine, and for now it boots and works as expected...
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That journal actually does tell interesting information, for instance found that I have this vulnerability on my Intel cpu.
Last boot log can be watched by:
journalctl -b -1Offline