Unlock books:
Unlock Cireka's Vow Drizzt's Journal book:
Complete Stand at Mithral Hall level
Unlock Illius' Youth book
Complete The Jungles of Chult level
Unlock Khelben's Letterbook
Complete The Wizard's Tower level
Unlock Nesme's Fall book
Complete The Yuan-Ti Temple level
Unlock Ygorl And The Dragon book
Complete Into the Underdark level
Unlock Zhai's Past book
Complete Attack at Cedarleaf level
Unlock pictures:
Complete War in Damara level - Battlefield picture
Complete Attack at Cedarleaf level - Cedar Leaf picture
Complete The Jungles of Chult level - Chult Jungle picture
Complete The Yuan-Ti Temple level - Chult Temple picture
Complete Gemspark level - Concept Art picture
Complete The Dragon's Lair level - Dragon picture
Complete Into the Underdark level - Githyanki Outpost picture
Complete The Lord of Chaos level - Limbo picture
Complete Stand at Mithral Hall level - Mithral picture
Complete The Wizard's Tower level - Wizard's Tower picture
