WET
43 Achievements
1,000
15-20h
Turret-Syndrome
Kill a total of 100 Enemies while using stationary gun.
20
How to unlock the Turret-Syndrome achievement in WET - Definitive Guide
As for avoiding the tanker, keep your gun aimed well below the horizontal cross grate to be sure you don't hit it. It seems like there's a good amount of space below the tanker where the spray will still hit it, even if it's not under your crosshairs.
There is only one occasion where you can choose to use a turret. Most of the time, you will be forced to use it and you have a set number of enemies to kill while you’re using it. Since the kills are cumulative, you will get this during your Golden Bullets run, provided you haven’t deviated to play some Points Count Mode.
Every so often you will be forced to use a Gatling-Gun to secure an area. You have no choice but to use the gun as it's a mandatory part of the chapter. Kill as many people as you can while on these parts and try to avoid shooting the explosive barrels as you won't be credited for the kills. You need to shoot down every enemy for it to count. If you miss this on your first play through use points count mode to earn your extra kills.