Tesla Force

This can be done on chapter 3 - „Forgotten Caves“. On all my playthroughs, chapter 2 always only had 2 elite encounters.

What you absolutely need for this achievement as a bare minimum, is the Radar Research fully upgraded! Otherwise you‘re not able to see which path you have to take, to reach the 3 elite levels. Elite levels are the pink circles with a flag as a symbol. Which elite enemy spawns is competely random, however.
To be able to beat the 3 elite encounters, make sure that you finish all other levels as fast as possible, you don‘t want to have the Dark Rituals clock on a high count when attempting this.
On the actual elite level, always try to focus on the elite and try to dodge the enemies with teleport (I researched teleport 3-4 more times, to have enough of them ready) and remember the elite will always follow you, so get those mech parts while running around the map. Levels become harder in chapter 3, as you won‘t be able to walk in a circle around the map. There are levels with a lot of dead ends, which forces you to go through all enemies to leave again, that‘s why teleports could save you here.
As soon as you killed your 3rd elite, the achievement pops.
Please comment, if you have any questions or stuff that helped you get this achievement. I‘ll gladly add it to the solution.