TL;DR
When starting new game give option to start with all achievements "incomplete"What?
Instead of Deleting all achievements to see "am I satisfying that achievement in that run" make possible to track separate achievements for separate saves.That include cross-save achievements like producing X amount of circuits.
Why?
I like to have shiny "medal" for 100% the game, but I also like to check - could I get GOTLAP/TINS/Lazy bastard in some experimental run or not.And I'm still salty that I did 100% achievement run in 1.1 but have to delete my achievements for 2.0