Portugal secured their ticket to the 2020 European Championship after defeating Luxembourg on Sunday afternoon.
Bruno Fernandes opened the scoring for the European champions on 37 minutes, before Cristiano Ronaldo sealed the win in the latter stages of the second half.
Serbia had to settle for a play-off spot in Group B after playing to a 2-2 with Group winners Ukraine.
Dusan Tadic and Aleksander Mitrovic cancelled out Roman Yaremchuk's strike to put the hosts 2-1 up, before Artem Besedin netted the equaliser deep in second-half stoppage time.
England finished of their qualifying campaign in fine style with a 4-0 triumph away to Kosovo on Sunday.
Gareth Southgate made a number of changes after clinching qualification on Thursday, but that didn't stop the goals from flowing in as Harry Winks, Harry Kane, Marcus Rashford and Mason Mount found the back of the net.
Czech Republic, who had already qualified, finished their qualifying campaign with a 1-0 loss to Bulgaria.
Vasil Bozhikov got the game's only goal in the 56th minute as Bulgaria finished third in Group A.
France finished their qualifying campaign top of Group H after defeating Albania 2-0 at the Arena Kombetare on Sunday evening.
Corentin Tolisso opened the scoring with a neat header on eight minutes before Antoine Griezmann got the second goal in the 31st minute.
Turkey finish second in Group H following a 2-0 win away to Andorra on Sunday evening.
Enes Unal was the hero on the day after netting a first-half brace to seal the points.
Iceland will be heading to the play-offs after finishing third in Group H, despite claiming over Moldova on Sunday night.
Birkir Bjarnason and Gylfi Sigurdsson got the goals for the visitors, while the latter also missed a penalty in the second half.