Gaslamp Games still wins the award for my favorite game achievement ever, in Dungeons of Dredmor–
“Sewer Brew” - you have to meet the devs in person, have a drink with them, and then they will activate the achievement on your Steam account.
This has made some completionists angry in the past, but like…it takes a good 500 hours or more to get all the other achievements. At that point, you are either grinding and silly about achievements, or you really love the game.
After over 800 hours of gameplay, I have 123 out of 124 achievements in Dungeons of Dredmor. One day, I will go to Canada and buy a drink for the cool folks who have brought a lot of fun into my life.