The achievements are going to be vehicle based except a couple. 343 is giving us a freebie achievement, which is by playing all 3 maps for the the first time.
Not really. Only 3 (or 4 if you count Splaser kills) actually are vehicle-based.
I still need to get that one castle dlc achievement where have to assassinate the enemy while he is using the hardlight shield. Anyone wanna help me please?