Pinball FX2

You need to hit the bumpers near the top right of the table about 10 times. Watch the video for the best angles at them.

Once you do this, the right ramp will light up. Hit it with some force and you'll end up on an unforgiving mini-playfield. The trick up here is to establish a good rhythm. Don't hit the ball too late and don't lose control of it. Hit the lit targets about 12 times and the achievement will unlock. This will take some practice.

I made this video.

This is a bit of a pain at least for me.
What you have to do is hit the bumpers about 10-15 times to start this mode. This is a little harder than the 360 because the bumpers don't seem to have as much bounce so you need to hit it back to them several times more than the 360.
And there's no clear shot at the bumpers. I either caught the ball with my right flipper, then released and then hit immediately. Sometimes I got a few good bounces off the bumpers, sometimes not. If I caught it on the left flipper I tried to make a bank shot off the L in TALE. You can also try a shot from the upper left flipper, but I didn't have much luck there.
However you get the ball to the bumpers, you'll know the fight is available when you hear the announcer says " Expel the invaders".
Hit the ball up the Mordred ramp ( The orange one ) to enter the playfield.
Here's where it can get frustrating. You have 2 small flippers and a giant hole down the center that seems a magnet for the ball. Keep hitting the lit targets.
The goal is to defeat 10 waves I believe. If you watch the video, every time you defeat a wave it gives you 200,000 points. Even though it shows 50,000 right before the achievement, I believe the last 200,000 was the one for the achievement.
For the 360 there was a time limit, I don't think there is for this one because I never had the flippers go dead like they can on the 360.
Anyway just keep trying to hit the targets and keeping the ball in the playfield and you'll eventually get this.
Good luck.