To be fair, all 3 of those tier medals could be excluded from the earn all medals achievement.
EA is the easiest to explain because you can join after EA ended.
Idea medal could be unachievable if IA decides to switch CIU into maintenance mode, don’t accept any idea suggestions ever and only focus on bugfixes.
And even bug medal could be impossible if you’re not actively hunting for a bug or IA decides to abandon the game totally (though if that happens then RIP to other medals since CIU is online only and requires constant maintenance and payment)
For me bigger obstacle is the one that requires you to win the league? Or anything competitive.