'Hello' in European Languages

Do you know how to say 'hello' in every official language of every country in Europe? (including Turkey and Russia?). Please note that this was actually surprisingly difficult to do as many languages have a greeting phrase but finding a common word for 'hello' among every language was actually very hard! If you are a speaker of any of these and I have got anything incorrect, please let me know in the comments and I will change the answer accordingly. Have fun!