Isonzo

Officers are one of the six available classes in Isonzo and come equipped with a whistle from level one. The whistle itself can be used to designate a limited-time instant spawn point for your team or to order an attack on a particular area. When in any match you can equip your whistle by pressing RB, then choosing either the spawn point or order by pressing Y to cycle between the two, and then by clicking RT once you've selected one of them.



While you could get lucky with a gas drop, your quickest option is to call one in yourself from one of the Officer Telephones located at any spawn point (Note: all call-ins have full cooldown timers at the start of a battle, so you might have to wait). You can find it by looking for the telephone icon on your mini-map, you might have to build it if it's only a green highlight, but the officers can build them. Before using it, press Y to switch to your flare gun and fire it in the air (directly above you would be good, but to be a team player, it's best to fire it above an enemy objective). Once the flare is up, hold X on the telephone to "call in support" and select either XYLYL Bromide Gas, Phosgene Gas, or Mustard Gas from the Chemical column, then select the flare marker where you're standing or above the enemy objective from the map on the right-hand side.



Once you've selected the point to gas, you'll have a little time to make your way to the location before the gas hits, and if you've gone with one of the two bottom call-ins, they'll last for well over a minute, so you'll have time to make it. Once the gas lands it'll flash up on your screen that you're in a gas cloud and should put on your gas mask, don't; instead, press RB to pull out your whistle and press RT to use the whistle. If you're quick enough, you should have time to press up on the D-pad to wear your gas mask, if not you'll probably die from gas inhalation; sorry about that.

Either way, the achievement should pop! 💀🐺