You might as well complain about experience point notifications, how are those immersive? When you read a book do you get notified about how much experience you gained for reading for an hour? Achievement notifications are part and parcel if you're playing a non-GOG version of a game.
When a third party program pops a square in my face to tell me i killed 40 ghouls (...) i get annoyed. Experience points makes me happy.