Ok op
let me post a real list now
>Field of Glory Empires/ Kingdoms
>Bulwark: Falconeer Chronicles
>Jet Lancer
>Shady Knight
>Swirl W@tch
>Heat Signature
>Cryptark
>Infested Planet
>Door Kickers 2
>Invisible Inc
>Labirynth of The Demon King
>Rings of Saturn
>Cyber Knights: Flashpoint
>Mullet Mad Jack
>I am Your Beast
>Approaching Infinity

Single player or multiplayer are valid.
I don't really do challenge runs unless I like the game so much it's actually entertaining.
For me, it was doing the longest Sekiro gauntlet with every boss, charmless + Demon Bell while only using pellets to heal, and no weapon skills.