diary entries is only for lore?

[dada]

or do u get anything out of collecting all of them

[Orion Invictus]

You get personal satisfaction, bragging rights, and that's about it.

[yes]

The XP is nice. You get an emblem too.

A book as a melee weapon or something like that would be a cool reward for collecting them all, but ya know they'd have to update the game regularly for stuff like that..