Here are the ones I’ve noticed lets list all new medals.
- BXR (punch someone then head shot them for the kill)
- Long shot(get a long range pistol kill)
- Spray and pray (get a long range AR kill)
- Alley op (pick up a power weapon a teammate launched)
- Combat evolved (pick up a power weapon you launched)
- Perfect kill (get the lowest ttk with a carbine,DMR, BR, LR or pistol) -Each medal varies in look as well.
- Gun punch (get the lowest ttk with any gun with a melee finish. -Example 3 shot with BR and a melee.
- Snipletaneous (get two kills with one sniper shot)
- Nadeshot (throw a grenade to pop the shields and finish with a head shot)
10, Cliffhanger (kill a climbing player) - Cluster luck (get two kills with one grenade)
12.Spartan charge kill (get a kill with spartan charge) - Ground pound (get a kill with ground pound)
- Hat trick (get three head shots in one life)
- Top gun (be the first player on your team to get 10 kills)
- Reversal (kill a player who shot you first)
- Hard target (recharge your shield 10 times in one life)
- Big game hunter(kill two people who have power weapons in one life)
- Brawler (melee someone as seconds after or at the same time the melee you and survive and get the kill)
- Last shot (kill someone with the last bullet in your clip)
- Power player (get 10 kills with any one power weapon in a life)
- Airborne snapshot (get a no scope kill with the sniper while jumping)
23, Extinction (kill all enemy players in a round of breakout) - Vanquisher (in breakout be the last man standing on your team and win)
- Rocket mary (get a long range kill with the rocket launcher)
- Target practice (kill an enemy with a rocket launcher who is capturing a stronghold)
Put the rest down if i missed any.