Leadfires, Leadfoots, or Leadshots are heavy enemies that resemble 8 foot tall mechs.
These enemies all have tanks on the middle of their backs that act as a weakpoint.
Any 3 mechs will do for this achievement. They do not need to be the same kind.
Only kills with one-handed sidearms, the Guardian and the Dragonfly, count towards the achievement.
Equip a sidearm using .
Using both the Guardian and Dragonfly on the same mech is okay.
Leaping between characters is okay.
Using the Quickdraw team perk is okay.
Being downed is okay.
Your AI team mates may still use Xenotech weapons and other methods to deal damage to the mech, but as long as you only use sidearms it should be okay.
However there seems to be one exception, if Izzy crystallizes the mech with her Shattergun. To prevent this from happening simply play as Izzy.
A Leadfire can be found early in Chapter 1, Checkpoint 3 (They Came…They Saw)
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