"This latest edition of the overview of European Council conclusions to date, presented in the form of a rolling check-list, is produced by the European Council Oversight Unit of the European Parliamentary Research Service (EPRS), the European Parliament's in-house research service and think tank."
European Parliament Study: European Council conclusions: A rolling check-list of commitments to date (pdf):
A very useful summary.
“Since 2014, the Unit has been monitoring and analysing the delivery on commitments made by the European Council in the conclusions of its meetings, as well as its various responsibilities, either in law or on the basis of intergovernmental agreements.”
Council Conclusions are non-binding but provide a legal basis when two or more Member States decide to cooperate.