Trained to Perfection Achievement
Trained to Perfection15
Defeat 10 enemies with Gamora's Executioner ability.This ability automatically unlocks during Chapter 12. It does a massive amount of damage to a single enemy. For this achievement, simply kill 10 enemies cumulatively with this ability.
All regular enemies will die instantly from this ability. Medium and heavy enemies will require you to damage them enough first. However, as long as you keep at it with this ability (and you will assuredly be making good use of it in the fights from Chapter 12 onwards), you will unlock this achievement very quickly because of how easily Gamora kills enemies with it.
As with other combat achievements, you could grind this in a single combat encounter by using the ability and getting kills, then reloading your checkpoint to repeat until you unlock this achievement.