Summoner PS2 Emulation (2000)
21 Achievements
PS4
Bag of Holding
Hold 100 unique items in Inventory.
3.2%
How to unlock the Bag of Holding achievement in Summoner PS2 Emulation (2000) - Definitive Guide
I got this after defeating the boss at the end of the Catacombs of Iona. I bought all items from shops I didn't have and did too much random encounters. Don't sell all of anything and this should pop at a similar time for you.
As the trophy description says. Be aware that currently equipped items do not count, so if you are close just unequip your characters until trophy unlocks.