I am copying and editing an excellent Win 8
solution by
KJT CD ACD, with his permission. The only change is that now
Rocket Launcher and
Spartan Laser count. Note that even if you have completed the Win 8 or WP8 version, you must redo each weapon.
The weapons you need to score kills with are as follows:
UNSC:
- Assault Rifle
- Shotgun
- Magnum
- Dual SMGs
- Sniper Rifle (bought for 1000XP or 50 CR in the pre-game lobby, sniper kills by AI marines may count, so it may not be necessary to purchase)
- Spartan Laser (bought for 1500XP or 75 CR in pre-game lobby, free redemption for completing Halo 4)
- Rocket Launcher (bought for 2000XP or 100 CR in pre-game lobby, free redemption for completing Halo 4)
Covenant:
- Plasma Repeater
- Plasma Pistol
- Needler
- Focus Rifle
- Brute Shot
The last weapon you will obtain is the Brute Shot, which does not appear until Mission D-1.
Note from MathGuy42: When I only had Rocket Launcher and Spartan Laser left, the Achievement app said I was 83% complete, leading me to believe there are 12 weapons.