World of Van Helsing: Deathtrap

This, as well as the other two achievements related to the specific color challenges, requires you beat a scenario with all three of the colored challenges at three stars. If they aren't maxed, then it won't give you the achievement.

The three required for this achievement are the bottom row, which increases the amount of health enemies have, lowers the efficiency of potions, and gives enemies a chance to respawn every time they die. They respawn at their spawn point when this happens.

Personally, as a sorceress, I found level 4, Bottomless Pit the easiest for all of the scenarios. It has two straightforward paths that lead to one base. The only tricky part is managing your time between the two lanes, but they are close enough together that you can switch between them easily.

I have noticed that if enemies are nearing your base, standing near them will cause them to target you and stop moving, which means you can stop the enemies and kill them before they can reach your base.

Note: At the time of writing, I have yet to complete this one. I have completed the other two color related scenario achievements as well as the difficulty 20 achievement using this method as well as reaching the final wave with the blue challenges on, so it does work. I will be trying again once I am a higher level.