with current campaigns:
based on current moscow east front central sector (1941-early 43): vyazma, 1st smolenks, rzhev,1st minks, brest, velikie luki)
based on stalingrad east front southern sector (1941-early 43): Petrikowka, uman, 1st kiev, kharkov, rostov don, 1st crimea
based on berlin east front center (1944-45): bagration, budapest belgrade, debrecen, balaton,dukla pass, vienna, vistula order (königsberg, breslau, poznan)
based on normandy western front (1944-45): operation dragoon,achen,hürtgen forest, siegfried line, antwerp, market garden, ruhr, remagen, bulge
based on tunisia north africa (1942-43): algiers, morocco, tunisia, tobruk, bengazi
based on pacific soutwest pacific (1942- late 1943): port moresby, kokoda track, milne bay, solomon islands (new britain, Bougainville), operation cartwheel (rabaul and north guinea), salamaua campaign
edit: 44-45 new guinea is superfluous . after neutralisation of rabaul japanese troops were cut off and isolated. rest of the fighting was spread and insignificant for rest of the war
For future
east front north sector (1941- 43) : baltics, leningrad, demyansk, ladoga, operation iskra, Saaremaa island(Operation Beowulf)
east front north sector (1944-45): baltics, leningrad, narva, courland ,saaremaa ( Moonsund operation)
east front south sector (mid 1943- 44): kharkov, belgorod, kursk, jassy-kishinev, Korsun,dnieper offensive, 2nd kiev, 2nd crimea
italy 1943-mid 44 : salerno, anzio, gustav line, monte cassino
italy 1944 mid -45: gothic line, argenta, bologna, Garfagnana
why italy seperated to 2 ? well, i dont want to see tiger 2s rolling around salerno or cassino
late pacific (1944-45): saipan and marianas, philipines, peleliu, okinawa, iwo jima
i didnt add gilberts and marshalls since those islands are flat tiny atolls. maps would be bad.
also aleutian islands are uneccesarry. only attu saw fighting and it was a tiny skirmish.
Burma-Malaya (1942-44): malaya peninsula, singapore, battle of yunnan-burma road, battle of imphal, battle of kohima
hugely overshadowed front of war. A nation basket. Chinese, aussies, brits, indians, thais, japanese.