I've found that 7 Grimoire cards are not unlocking, even though the assumed criteria have been met. Now, it could be that the criteria are just non-obvious, but I've looked at a lot of people's Grimoires and none of them have these 7 cards:
1. Guardian > Sub-Classes > Guardian Abilities
I assume this should be unlocked immediately upon creating a character, or at the very least after choosing your first ability.
2. Inventory > Economy > Motes of Light
Should unlock upon earning a Mote of Light, like all the other currencies under Economy
3. Places > Mercury > Mercury
Figure this should unlock after playing a Mercury map in the Crucible
4. Places > Venus > Venus
Figure this should unlock after reaching Venus in the story more or playing a Venus map in the Crucible
5. Places > Moon > Moon
Figure this should unlock after reaching the Moon in the story mode or playing a Moon map in the Crucible
6. Places > Mars > Mars
Figure this should unlock after reaching Mars in the story more or playing a Mars map in the Crucible
7. Activities > Crucible Playlists > Combined Arms
I played a Combined Arms match and didn't get this. Could be related to the fact that the match showed up as "Clash" when started instead of "Combined Arms"?
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I'm finding the same thing. Just to clarify, these are the acutally planet Grimoire cards, not the "Ghost Fragment" versions of the cards. From everything that I've read online so far these planets (with the exception of Mercury) are supposed to show up when you unlock them. Mote of Light is supposed to unlock when you receive one, and I'm guessing that Guardian Abilities and Combined Arms are supposed to activate when you use them but they are not.