There are 30 Blizon crystals. You have to collect 29 of them after the day one patch and not 30 like before.
They are contained within Planet 5: Blizar Prime (23 Crystals) & Planet 7: Cordelion (7 Crystals).
IMPORTANT: Make sure you collect all on Blizar Prime before advancing the story!!! You cannot go back there at some point so you have to start a NewGame+ to get the trophy!
These crystals are used to switch these planets between different dimensions.
Good luck!