Terminated — Win a game with the AI difficulty set to Humankind.
Lord of the Flies — Win a game against 3 AI at Endless difficulty on the tiniest map.
There Can Be Only One — Win a game against 9 AI at Endless difficulty on the largest map.
uuuuugh, there better be an easy way to cheese these.
Playing against Endless difficulty in other Amplitude games was just not fun, no matter how much you tried to nerf them with custom traits.
EDIT: It seems that they forgot to change the "Endless" difficulty to "Humankind" in the latter two achievements on Xbox. They are correctly all listed as "Humankind" on Steam.