This is a tough one.
You usually got it very easily during normal gameplay thanks to randoms in multi-party areas.
But since most people moved on to PSO2NG or only do the highest level quests, it can get very frustrating nowadays.
You basically want to kill as many enemies as possible quickly.
The white light pillars indicate PSE progress and your need to reach level 8 before the effect runs out.
It's completely random so you might need a few attempts.
I recommend going into a Point Goal quest like the
Nightfall Province Exploration
.
Choose the normal difficulty to kill the enemies faster.
You either need a friend or a fairly high level if you're doing it solo to deal enough damage quickly.
Redo the quest a few times until your RNG luck strikes. Good luck!
Since Achievements don't transfer with cross-save, I had to redo it two times on PS4 and Steam.
I managed to get it solo both times but my character is already at level 87.
This was literally my 5th Achievement and I got it randomly when the global release launched for Xbox/PC back in 2020.
Really shows how the shift of the playerbase impacts the PSE chances in OG PSO2.