Were these announced anywhere? If so, I must have missed it.
Anyway, I now see the following:
Vigilant Victory - Win as Arceans
Out of the Deep and to the Stars - Win as Torians
A Little Help From My Frenemies - Complete the Mercenaries campaign
Revenge is Ours - Win as Snathi
The Return of True Face of Fear - Complete the Snathi Campaign
Since I've already played the Snathi campaign I guess I'll have to play it again to pick up the achievements. Fortunately (for me) I postponed starting the Mercenaries campaign until yesterday, so I should be able to get that one in a few days.