[Achievement Trick] How to Fight Igrexion : Advanced II
Achievement desc : Stop Igrexion's gravitational field
How to : During Phase 2 , Igrexion will try to use his gravitational field, you need to stagger him during the start-up to cancel it. Each stagger becomes harder and harder normally BUT if you leave the area and come back, the stagger count reset to 0 and you can stagger him easily again and again.
PS : During Phase 3, Igrexion use burning field which DOESN'T count for the achievement !