HI @anon91079766,
You can fully remove all celebrations, but to minimize them, make sure the extra celebration hack isn’t activated on your account. More info on this hack in How to Control Your Profile Settings in Asana | Product guide • Asana Product Guide. I would also recommend filing this request in #productfeedback although I can’t promise if/when this work would get prioritised.
Regarding pop ups, you can upvote this existant feedback → Ability to disable pop up notifications when creating/copying/deleting a project or task