This achievement can be obtained on the map Red Forest: The Temple of Purgation by repairing the generator in the basement of the Temple (not the killer basement) and escaping. Below are pictures of the generator as well as where to find it.
You can use the offering
The Last Mask to increase your odd of getting this map, however, you may end up getting Red Forest: Mother's Dwelling which doesn't have the temple on it.
When going for this achievement I recommend bringing in a toolbox to increase repair speed. This generator is in a predominant area that tends to be patrolled by killers more frequently so getting it done quickly is in your best interest.
At this time, it seems that you don't have to be on the generator when it's completed in order to get the achievement, you just have to have been repairing it at some point during the match. However, I would recommend finishing the generator if possible, just in case this changes in future updates. EDIT: You now have to be on the generator when it is completed in order to get the achievement.
If given the option I recommend escaping through the exit gates rather than the hatch. The hatch seems to be hit or miss when it comes to unlocking achievements.