If I did this on Legendary, I would call it "Royal Flush"--- so dibs on the name, credit, if/when someone pulls THIS off on the top difficulty. But, just on Commander:
Defender of Humanity/Valhalla - Beat the game on Commander+ difficulty in Ironman mode
The Few and the Proud - Beat the game on Commander+ difficulty without buying a Squad Size upgrade
The Untouchables - Beat the game on Commander+ without losing a soldier
Exquisite Timing - Beat the game on Commander+ difficulty by July 1st

The last Avatar is in clean flanking range, double-shot 'em with the Ranger-- and if the RNG flubs it for some reason, everyone else is full on moves, so hard to lose at this save.
This campaign was also trying out some mods, so you may be prompted to install them before loading.
As it seems there are international language conflicts: this save file is for the English/US release.