How some people complete so many games in a year I'll never know! I wish I was back in school/college so I had more free time to play, lol. Here's my list of completed games in order since the start of 2018;
God of War
Final Fantasy XII
Kingdom Hearts Re:Chain of Memories
Kingdom Hearts 358/2 Days
I'm also still actively playing Overwatch too.
I imagine I could've finished a lot more games if three games in particular didn't take too long, those being Xenoblade Chronicles, Persona 5 (Both took me two months each) and Fallout 4 (Took me just over a month, I did a lot of side stuff too), so that was five months for just three games, admittedly they were much longer games than everything that came after them (The closest was Final Fantasy XII which took me around 68 hours)
Also I played Kingdom Hearts Re:Chain of Memories twice since there's a second story mode, so am I allowed to class that as finishing two games? First playthrough took me around 22 hours, second one took 10 hours, lol.
You completed the same amount of games as me this year and I had lots of free time. Between May and September I only completed one game. When I was in College I could complete maybe 5 games.