Right, quick question: what does the achievements "Complete first anniversary game" and "Complete second anniversary game" mean?
It means that you have to play the anniversary games and get the codes (you get them when you finish the games).
https://keisi-studio.itch.io/lust-age-first-anniversary-short-game
https://keisi-studio.itch.io/lust-age-second-anniversary-short-game
I have combed through the 1A mini-game backwards and forwards more than a dozen times now, but I never get a code from it. I even deleted the game and all of its data and started over from scratch. But still all I get are "Adios~" and "Game Over".
I had no problems with the 2A game.
I'm playing the PC version on Arch Linux.