RESIDENT EVIL RESISTANCE

You have to down survivors 4 times during a simple gameplay as mastermind. If you are having issues I would advise getting the special cards you get from openings chests. Some of them raises damages to traps. Also Alex unlocks a card as you rank up that lets you put 3 mines together. Turn off lights in rooms and stack mines together and that seems to work. Another strategy is lowering their health with machine gun and put traps when they are trying to run away.

Alright I came up with an strategy to making getting this achievement much easier. The achievement itself is all about downing survivors by using traps. So traps like Landmine, High Explosive Mine and Shock Trap can down survivors. There's a few problems with this however.

Martin specializes in disarming traps. Most survivors can easily fire safely from a distance to destroy em. High Explosive Mine by default is worth 4 Bio Energy in order to use it. Thankfully, what I'm about to tell you will help in many ways. Keep in mind, this will require a lot of patience to pull off.

The other traps either temporary causes effects or doesn't really hurt them like Airburst Trap. Although, it is possible to use some of them in order to get survivors right where you'll need them. I also recommend using Air Cannon for a similar purpose. It is one of those creative achievements use your imagination.

You can use stuff like Discount, Energy Booster-Traps, Efficiency Mod-Traps, and Conventor Mod-Traps. All of then can temporary lower the amount of Bio Energy you'll need to get traps. Now the next part is very important because you have a point limit of 25 originally 20 for Equipment.

I came up with a prefer set to greatly improve your chances at downing survivors using traps. Just remember you have to play as Alex for this to count. You also can place traps close together just not too close. If done correctly you'll do a lot of damage possibly downing them easily.

The recommend Equipment set as they follow below...
1. Military Grade Explosives III
2. Sturdy Materials
3. Inductor III
4. Camouflage Coating

This set up perfectly works to your advance. You got everything except durability. But it's better to not have your traps being durable. Military Grade Explosives III is the highest possible damage you can get from your traps. Camouflage Coating makes it more difficult for survivors to spot traps.

Inductor III is the fastest you can set and armed traps. This is perfect for Alex since that's one of her strengths. Sturdy Materials has a few multiple effects making it worth getting. All of these effects are moderately increased. Duration of negative and restraining effects caused by traps.

Along with that is increased trap durability as well as the time Martin needs to disarm your traps. Obviously, a team without Martin makes getting this achievement much easier. Another great thing is among Alex's exclusive cards. She has two great trap cards to increase your chances as well.

Virus Mine when activated will cause survivors exposed to become infected. This is great because that also plays into Alex's other strength as well. The more you can keep them infected, the greater your chances at downing them. Landmine (3) is a set of three landmines you place as well as set together at once.

Oh wait it actually gets better than that folks. Clone card may cost slightly more than most cards it copies. But it also works with trap cards. This greatly increases your chances at using traps. Keep in mind, those exclusive cards are meant to be used from Areas 2 and 3 respectively.

This pretty much covers what I recommend you should do to get this achievement. Of course, if you don't have this stuff keep ranking up the Masterminds as well as using points in Shop. Especially on the most expansive containers since most of what I recommended came from there.