They really should have worked it so that instead of getting more grimoire score for doing something, we should have been rewarded with emblems, shaders and ghost shells. Example -- Instead of killing 5000 Hive enemies and getting a total amount of nothing, we should get a Ghost Shell that changes Ghost to look green/black and have three yellow eyes. They could have done this for all the enemy factions and even added in challenges for specific enemies/killing enemies in specific ways. Instead, we get more grimoire score (yay) which does a collective amount of f-u-ck all.