Isonzo

I recommend attempting this achievement on a fresh server, so from the main menu press RB so you're in the 'Play' menu. From here press Y to create a Custom Match, turn on the Friends Only setting, and choose the 6th Battle of the Isonzo Offensive starting on the Carso map (This works on any map, but I found this one to be easier).

I went with a Rifleman, but the Engineer would work just as well. This guide is written as if you're using the Rifleman, though. When you get into the lobby choose to side with the Kingdom of Italy so you're attacking. If you start as the Austro-Hungarian Empire, you can click the leftmost Emblem from the spawn screen to switch screens.

Start by heading to the objective and keep an eye out for enemy barbed wire to cut, HMG (Heavy Machine Gun) to sabotage, Forward camps (Respawn points) to sabotage, etc (Destruction points). They "should" be fairly easy to find. While you're assaulting the objective, keep an eye on your teammates/go over to them to see if they can be healed. Hurt friendlies have a red marker on their bodies and it should pop up on the screen to heal them, which you can do by pressing down on the D-pad to pull out your bandages and holding LT (Healing points). These two are probably the hardest ones to get sorted legitimately, so once you've done that the final two are very straightforward.

After that, kill an enemy soldier by any means you wish (Combat points), and then finish by building an ammo crate by pressing right on the D-pad to hold your shovel; the ammo crate will be the only buildable item you'll have, so place that down and hold X to build it (Building points).

With that, your achievement should pop! 💀🐺