Executioner achievement in Titanfall

When a Titan loses all it's health and it shows the black/yellow pattern that's when you go up close and melee it to "execute" it. The pilot is required to be inside the Titan when you execute it, Auto-Titans do not count. Do this two times in one game on Haven.

The Frontier Edge DLC only playlist should be the easiest to get this map. Also Last Titan Standing since you will be guaranteed to have Titans.