See the Broken Mirror - TBM Collectibles Achievement

For this achievement you'll need to complete the collectible achievements for three different zones, Plane of Health (Relics of Health), Reborn of Faith (Demiplane of Decay), Reborn into Faith (Demiplane of Life). There's four sets of collectibles for each of these zones which means you'll need to complete 12 sets in total.

This is one of two achievements which is required for the Master Scavenger of The Broken Mirror achievement which rewards the player with a 38 slot bag and 1 extra Trophy Slot, a powerful upgrade for your character if you min/max.

 

Required Achievements:

Relics of Health (Plane of Health)
Reborn of Faith (Sul Vius: Demiplane of Life)
Reborn into Faith (Sul Vius: Demiplane of Decay)