100% Guide on Collectibles! Achievement is now obtainable. You do not have to complete each level for the collectible to register in the journal. After getting the one you are missing, it is okay to exit to camp. If you kept up with the guide and already have all the collectibles. Then start a new character and pick up the tome beside the merchant and the chevo will pop.
(Update Sept 2021: For some people, despite having every collectible as mentioned below, the achievement still will not unlock. Thanks to HamsterLV for confirming a way to get it to pop. It's not a quick fix but it worked for him. Start a new character, play solo or as host, recollect every collectible from the start. For him, the achievement popped at the end of Act II).
With the crappy tracking system on the game, a detailed guide for this is too much effort. But, I will to make a log of all the collectibles to assist in narrowing down where your missing collectibles can be found.
In total you should have:
6 Paintings-----8 Reliefs-----70 Tablets-----38 Tomes
Collectibles can be picked up on any difficulty setting but must be collected by 1 Character.
PAINTINGSWulfgar, Dragonslayer - Ver. Jam. act I
Courage of the Tiger - Fury Icewind act II
Will of the Foehammer - Order Light act I
Endurance of the Elk - Fury Icewind act I
Joerann, King of the Tiger - Fury Icewind act I
Nagaan, Queen of the Bear - Fury Icewind act II
RELIEFKelvin Defends his cities - Crystallne Dreams act I
Kelvin faces Araxabrax - Mask Kelvin act III
Kelvin Traps a Bronze - Fury Icewind act II
The Burning of Valtaeros - Companions Icewind act III
Kelvin Surrounded - Mask Kelvin act II
Kelvin Rides the Dragons - Goblin Shard act III
Kelvin Triumphs over Dragons - Order Light act II
Kelvin Defeats Araxabrax - Fury Icewind act III
*DO NOT look through your journal at Paintings & Relief and compare the picture you see to what you see in a video or pick up on the map. There is some D&D trickery and several pictures for certain maps are swapped with pictures from other maps. Kelvin Triumphs over dragon, the picture of the relief is completely different looking from the picture in the journal, and the paintings you pick up in Fury of Icewind in act I & II are swapped.
TABLETS
(click 
to filter by group)
History of the Smallfold of Icewind Dale: 9
Raiders and Caravans - Companion Icewind Act II
Good Mead - Goblin Shard Act II
Knucklehead Trout - Goblin Shard Act III
The Rise of Kessel - Crystalline Act I
Termaline Mine - Verbeeg Act II
The Long Winter - Companion Icewind Act I
Rendaril's Emporium - Verbeeg Act III
Resettlement of Caer Konig by Reghed Tribes - Order of light Act III
Destruction of Targos - Mask Kelvin Act II
The Rise of Clan Battlehammer: 10
The Dwarven Forge - Verbeeg Act I
The Goblin Raid of Termaline - Mask Kelvin Act I
The Mining of Kelvin's Cairn - Companion Icewind Act III
Coronation of the King - Verbeeg Act III
The Arrival of the Dwarves - Goblin Shard Act I
Conflict with the Frost Giants - Companion Icewind Act I
Construction of Bangor's Span - Companion Icewind Act II
Expulsion of the Verbeeg - Verbeeg Act II
Settlement of Cindryc's Rift - Goblin Shard Act II
The Long Winter - Crystalline Act II
The Tale of the Crystal Shard: 8
Destruction of the Towers - Crystalline Act I
The Shard's Voice - Goblin Shard Act III
Kelvin's Defeat and the Loss of the Shard - Order of light Act II
Crystal Remnant - Mask Kelvin Act I
Discovery by Kessel - Verbeeg Act II
Goal of the Shard - Mask Kelvin Act II
Theories of Orc Raids Drivin by the Shard - Order of light Act III
Mysterious Origin - Mask Kelvin Act III
The Rise and Fall of Kelvin the Great: 7
Temple of the Everspring Tree - Crystalline Act I
Kelvin's Marriage and Seat of Power - Mask Kelvin Act III
The Hall of Judgement - Mask Kelvin Act I
The Statue of Annam - Mask Kelvin Act II
Kelvin's Alliance - Crystalline Act II
The Tomb of Kelvin - Fury Icewind Act II
Kelvin and the Crystal Shard - Crystalline Act III
The Fate of Netherese: 9
The Netherese Testaments - Goblins Shard Act III
Betrayal in Netherhall - Fury Icewind Act I
Dead Netherese - Verbeeg Act I
The Sea of Moving Ice - Crystalline Act II
Settlement of Netherhall - Goblin Shard Act I
Mysteries of the Netherese - Order of light Act III
The Sudden Disappearance - Crystalline Act I
A Sudden Turnaround - Companion Icewind Act III
Scattered Ruins - Mask Kelvin Act III
Ostoria, Kingdom of the Jotun: 9
The Deeds and Death of Hjurnur Dragonslayer - Verbeeg Act III
The Wonders of Ostoria - Order of light Act II
A Rain of Stars - Goblins Shard Act I
Vonindod - Verbeeg Act I
Othea's Offspring -Companion Icewind Act III
The Mask of Kelvin - Crystalline Act II
The Thousand Years War - Goblins Shard Act II
The Fall of Ostoria and the Dark Age of the Jotun - Fury Icewind Act II
Annam the All Father - Mask Kelvin Act III
The Geography of Icewind Dale: 8
The Reghed Glacier - Companion Icewind Act I
Kelvin's Cairn - Fury Icewind Act I
The Wounded Mountain - Mask Kelvin Act III
The Sea of Moving Ice - Verbeeg Act I
The Rivers - Order of light Act I
The Spine of the World - Crystalline Act I
The Hazards of Icewind Dale - Goblin Shard Act I
The Lakes - Mask Kelvin Act I
The Life of Verbeeg: 10
Allegiance with Utaar - Companion Icewind Act I
Their Hill Giant Differentiators - Goblins Shard Act III
Degenerations and Obsessions - Goblin Shard Act I
Tactics of the Verbeeg - Verbeeg Act I
Dominated by Kessel - Verbeeg Act II
Their Association with Goblins - Order of light Act I
A Life in the Cold - Mask Kelvin Act II
A Simple Life, A Cunning Mind - Fury Icewind Act I
Allies of Kelvin - Mask Kelvin Act III
Birth of the Verbeeg - Companion Icewind Act II
TOMES
Journal of Goffin Ironmane: 8
Defeat of the Goblins and the Adoption of Catti-Brie - Companion Icewind Act II
Lament for Mithral Hall - Companion Icewind Act III
Battle with a Frost Giant King - Verbeeg Act II
Battle with a Orc King and Bruenor's Coronation - Goblin Shard Act III
Trials of Goblins, Orcs, Giants, Yeti, and Crag Cats - Goblins Shard Act II
Abondoning Kelvin's Cairn - Companion Icewind Act I
Discovery of Chardalyn - Verbeeg Act III
Scouting the Vally - Crystalline Act II
Notes From Regis: 7
Nothing to Do - Order of light Act I
Where are You? - Goblin Shard Act I
A Celebration in my Honor - Verbeeg Act I
A Missed Visit - Starting area beside Merchant
Targos Reconstruction -Companion Icewind Act II
Feasted by the Reghed - Companion Icewind Act I
Dwarven Housing - Fury Icewind Act I
Duergar Campaign for the Shard and Icewind Dale: 7
The Call - Crystalline Act I
The Dwarven Forge - Verbeeg Act II
Dominated by Hagedorn - Order of light Act II
Thoughts on Cultists - Verbeeg Act III
We are Forsaken - Companion Icewind Act II
The Journey - Crystalline Act II
Flight of the Battlehammers - Crystalline Act III
The Last Regrets of Tarajhaba: 7
The Founding of New Netheril - Fury Icewind Act I
A Desperate Bargain - Order of light Act II
The Return of Magic - Order of light Act III
The Search for Ythryn - Mask Kelvin Act I
Questions of our Installations and our Patron - Fury Icewind Act III
The Flourishing of New Netheril - Fury Icewind Act II
The Ruin of Netherese - Mask Kelvin Act II
The Crenshinibononmicon: 6
The Power of Light - Crystalline Act III
The One Vessel - Mask Kelvin Act I
The Seven Masters - Companion Icewind Act I
Confluence of Seven Words - Order of light Act II
Purity of Ambition - Order of light Act III
Kelvin the Great - Order of light Act I
The Personal Accounting of Raddix Rotax: 3
Tribe of the Goat - Crystalline Act II
Cultist Machinations - Order of light Act I
The Value of a Goblin Soul - Companion Icewind Act III
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I thought certain collectibles were glitchy, even though picked up, they do not register within the journal. However, I'm finding that it is not certain ones, its any of them. The one I was missing, I must of picked it up atleast 10 times before it finally registered in the journal. Others are confirming the same. I do suggest using the list above to find the level your collectible is missing on and then using Game Guides Channel on you tube to find the collectible within the level. His guides are complete and I only found 1 collectible that he missed which is mentioned in the comments by oONeonDemonOo on broklyn city. Thank you!