Suppose I play X hours on a trip when I have no internet access, and then when I have internet access I connect my Steam Deck and I would expect that if I played X hours on the trip, the hours would sync to my profile and add them to my game, but it doesn’t seem to be like that, am I doing something wrong or is this a normal Steam behavior that can’t be changed?
Depends on the game. There is no functionality in Steam for buffering them offline, it’s just that some games run the check for all achievements every time you load a save or gain a new achievement, while others only do it for the one you just gained.
That’s why I have “complete 40 substories” in Yakuza 4, but not the one for finishing 20 of them - it triggers when you complete the 20th, and never again.
Meanwhile I imported a complete save to a different game for mod dev debugging purposes, and it unlocked every single achievement the game had the moment I loaded that.
Yup. It’s up to each games dev to write the hooks for the achievements.