Zexinis

ok i got the achievement for for reading all the terminals in the game Dear Diary... but it will not give me Heavy Reading for reading half of them. the other achievements that i did get but it wont show up are Birth of a Spartan, Headhunter, and Skulls Taken. is there any way to fix this? i didnt pay any mind to them for awile but i just got halo 4 and seen in waypoint that i need them to unlock some in game stuff. pleas help me