Here is the full list of all 16 Precursors: Armored Angels achievements.
You have successfully completed the training mission.
You have successfully evacuated people from Otnia.
You hunt machines effectively.
You have successfully negotiated with machines, the federation, or the rebels.
You have acquired a large number of resources.
You have made an assault on a planet of intelligent machines.
You have won and defeated heartless and ruthless machines.
You have successfully developed a new technology.
You have developed one of the most advanced technologies in its category.
Official award and admission to the rank of Armored Angels as a private.
Official award and rank of corporal for achievements in the campaign against machines.
The mech brigade sergeant is not just anything. Not everyone is able to boast of such a military rank.
An ensign is someone who achieves goals with determination without giving up easily. That is why not everyone can be an officer.
The lieutenant knows that where there's a war there isn't much room for fun. Fun games have nothing to do with war. Waging a war requires concentration.
The mech brigade commander doesn't get too attached to his robot. He knows that this is just a tool that can always be replaced with the better.
A captain is someone who values the people and resources he commands. He is someone for his people whom you can trust and entrust your life to.