Here is the « kolodka » (medal bar) Nicholas II wore during the War :
From left to right : St. Vladimir 4th class, Croix de Guerre (France), Coronation of Alexander III, Death of Alexander III, Bicentenary of Battle of Poltava, Centenary of War of 1812, Tercentenary of the Romanovs, Bicentenary of Battle of Gangut, Order of Danneborg Denmark), Order of the Redeemer (Greece).
Missing is the Order of St. George (4th class) he wore in captivity and which was probably stolen in Ekaterinburg by his murderers. I don’t recall having seen photos where he had the Croix de Guerre on but he did wear it, as the French Ambassador recalls in his memoirs. Oddly enough he didn’t give himself his own Coronation medal, and it seems the other medals which bore his profile (Poltava and 1812 War) were worn turned around showing their reverse. Maybe it was out of modesty or it was the tradition, I don’t know.
The Order of the Redeemer had 5 classes, the lowest of which (Silver Cross) had a silver cross with white enamel (the others had gold). So it looks like he got the lowest one. I suspect he received it when he stopped in Athens in Autumn 1890 on his way to the Far East (as he can be seen wearing it afterwards). The King of Greece was then his uncle, George I, the father of his cousin George who accompanied him on his trip to the Middle and Far East.
As for the Order of Dannebrog, it looks rather like the Cross of Honour of the Dannebrog which, unlike the badge of the 4 classes of the Order, is all silver (the Order itself has a white enamel cross lined with either gold or silver cross). From what I have read it seems this Cross was bestowed to people who already had the Order or to members of the Danish Royal Family. Either he was considered as a member of the Family (he was the King’s grandson) or he may have received a Knight’s Cross earlier and only wore this « higher » cross. I don’t know when he received his Danish medal but photos show he got it while he was still Heir to the Throne, so he certainly received it from King Christain IX his grand-father, as the monogram on top of the cross shows.
As Emperor, he was awarded a number of high Foreign orders, including the French Legion of Honour and the British Order of the Garter, which he received in 1893 (he is Knight No. 802). He probably received the highest Greek and Danish orders too. He only wore these orders for State visits but he probably wore his Greek and Danish medals all the time because he saw them as family orders.
Maybe someone from the Danish & Greek Royal Families sections, or the Militaria one, would know more about these medals.