Check your Inventory under 'Collections'. You can see if you have collected all shards on a map.
It says f.x. Hinterlands 17/22. That means you are missing 5 shards of 22 total in this area (and probably one ocularum).
The Hinterlands - 22 Shards
The Outskirts: 4
Lake Luthias: 4
Redcliffe Farms: 5
Grand Forest Villa: 5
Lady Shayna’s Valley: 4
The Storm Coast - 13 Shards
Storm’s Solitude: 3
Morrin’s Outlook: 3
Waterfall Cave: 3
Driftwood Margin: 4
Forbidden Oasis - 15 Shards
Desert Edge: 5
Alres Peak: 5
Solasan: 2
Upper Walkway: 3
The Western Approach - 14 Shards
Giant’s Staircase: 3
Dustytop Fort: 3
The Canyons: 3
Echoback Canyon: 3
Old Prison Road: 3
The Exalted Plains - 16 Shards
Halin’Sulahn: 6
Eastern Ramparts: 5
Riel: 5
The Emerald Graves - 13 Shards
Great Bear Cove: 7
Gracevine: 6
Emprise du Lion - 13 Shards
Tower of Bone: 6
Judicael’s Ring: 7
The Hissing Wastes - 8 Shards
Rock Top Ridge: 1
Sunstop Mountains: 3
The sand Crags: 2
The Cove: 2
None: Crestwood, Haven, Skyhold, The Fallow Mire, Val Royeaux, The Arbor Wilds, Temple of Mythal + all other special/seperate quest locations
The Temple Of Pride in the Forbidden Oasis
You need a total of 114 shards to complete the quest.
6 shards is needed to open the very first door, the entrance to the temple. Inside the temple you will need more shards to open the doors to the following:
The Spirit Calmed: 3 doors
The Cold Endured :3 doors
The Fire Captured: 3 doors
All the first doors requires 6 shards.
All the second doors requires 12 shards.
All the third and last doors requires 18 shards.
Means you need 36 shards for each room downstairs.
The last door on the main floor (electricity) opens when you have finished the last room down stairs. No shards needed.
In each room there is a coffin. When you open and loot them completely they give you:
Every first room:: 4 resistance points + 7% Resist Belt
Every second room: 6 resistance points + 15% Resist Belt
Every third room: 10 resistance points + 30% Resist Belt
The coffins also gives you essence, runes and a little coin. Sometimes a power amulet.
If you chose to farm items instead the coffins will not give you any resistance point. It is only when you EMPTY them completely! So, chose carefully what you want
You end up with +20% fire, cold, spirit and electrical resistance when all doors are opened and all coffins looted entirely.