Here is the full list of all 29 Mecha Ace achievements.
Run away during the battle of Crown Station.
Help Hawkins destroy Lightbearer.
Use Lightbearer to destroy the enemy fleet.
Use Lightbearer to force an end to the war.
Intimidate the enemy fleet into surrendering.
You became head of the Damocles Initiative.
Recover a prototype from the enemy.
Complete the main story.
You fell in love with Hawkins.
Romance your wingperson.
Romance your bridge controller.
Romance your deck chief.
You destroyed an enemy machine by landing on it.
You resorted to corporal punishment.
Bury Hawkins in a swarm of missiles.
You saved Crown Station from destruction.
Your willpower failed you at a crucial moment.
Defeat the Roland while Hawkins is piloting it.
You got everyone, yourself included, killed.
Every major character survived to the end of the story.
Max out your melee combat ability.
Max out your ranged combat ability.
You flew a swift machine painted red and gold.
End the story with less than 20 Reputation.
End the story with more than 80 Reputation.
You ended the story with more than 80 kills.
Play through the story with an all-female cast.
Play through the story with an all-male cast.
You lost your ranged weapon in combat, twice!