There are 235 collectibles across the three campaigns. (144 observables and 91 breakables) Lore Master is unlocked for finding all the observables in the game and Hooligan is unlocked for finding all the breakables in the game. All collectibles are saved immediately, so if you die you do not need to go back and recollect them.
Knights Campaign
1.1 Warlords And Cowards 0:40
1.2 And Stay Out 3:06
1.3 The Blackstone Legion 5:25
1.4 Valkenheim In Winter 7:28
1.5 Sabotage 10:14
1.6 Wolves Among Sheep 13:26
Vikings Campaign
2.1 Raiding The Raiders 0:34
2.2 Viking Diplomacy 2:45
2.3 Wood, Iron, And Steel 4:31
2.4 Up The Beach 6:53
2.5 Reconnaissance 9:04
2.6 The Great Raid 13:08
Samurai Campaign
3.1 Duty 0:41
3.2 Thinning The Herd 3:27
3.3 Picking Up The Pieces 7:20
3.4 Unity 9:38
3.5 Honor 12:56
3.6 Apollyon 18:07