Switch (i bought it this year so these are the games i've played on it)
Mario Kart 8 Deluxe
Since these are all MP i have not really completed any of them.
Assassin's Creed Odyssey.- Only a few hours in but im loving it so far.
Black Ops 4
Forza Horizon 4
Destiny 2 Forsaken
Star Wars Battlefront 2
Sea of Thieves
No Mans Sky
State of Decay 2
I beat the campaign in Destiny Forsaken but thats about it.