Reddit.com/r/swtor/ has another great post that list all the Warzone Medal that you can get.
I’ll just copy the important parts here.
Medals Accumulated Earn 50 Valor and 5 Warzone commendations each
- The Gold ranking is awarded for earning 6 or more medals during a match
- The Silver ranking is awarded for 3-5 medals
- The Bronze ranking is awarded for 1-2 medals
Announcements (thanks Ayestes):
- Unbeatable announcement is unlocked if you earn 4 medals without dying.
- Invincible announcement is unlocked if you earn 7 medals without dying.
- Immortal announcement is unlocked if you earn 9 medals without dying.
- Medic – 2.5k healing from a single heal
- Demolisher – 2.5k damage from a single attack
- Trauma Surgeon – 5k healing from a single heal
- Anihilator – 5K damage from a single attack
- Quick Draw – Getting a killing blow on one player
- Combatant – Dealing 75k damage
- Destroyer – Dealing 300K damage
- Healer – Healing 75K
- Savior – Healing 300K
- Defender – Earning 1k Defender Points
- Warden – Earning 3k Defender Points
- Assassin – Killing a player in a one-on-one fight
- Shield – 5k Protection
- Protector – 50K Protection (thanks meatballz/adlarn)
- Guardian – 2k Protection since last death
- Paladin – 10k Protection since last death
- Commando – Killing 10 enemy players
- Soldier – Killing 25 enemy players
Valor Titles: Every 10 ranks in valor will give you a new title -
Note: Valor Rank 60 is required to open Battlemaster Bags
- Skirmisher – Valor Rank 10
- Duelist – Valor Rank 20
- Gladiator – Valor Rank 30
- Centurion – Valor Rank 40
- Champion – Valor Rank 50
- Battlemaster – Valor Rank 60
- War Hero – Valor Rank 70
- Conqueror – Valor Rank 80
- Warlord – Valor Rank 90
- Elite Warlord – Valor Rank 100