I've 60%'d so many games this year before moving onto something else lol.
Metroid Prime 2 is the only one I can think of that I started and beat in 2018. There were a handful of games I began in 2017 and finished playing in 2018, though. Xenoblade Chronicles 2 being one of them.
Retro Tech Select - My Youtube channel. Covers throwback consumer electronics with a focus on "vid'ya games."