List of Halo 5: Guardians medals
From Halopedia, the Halo wiki
For the first time in the series, Halo 5: Guardians allows the player to select between 4 different announcers with the Voices of War REQ Pack. Each supports every medal that has a voice line.
On Halo Waypoint, Medals are tracked and categorized into 7 categories: Kills, Style, Weapon Proficiency, Warzone, Infection, Objective (separated out into multiple gamemodes for this list), and Vehicles.
List of medals
These are medals, or voice lines potentially referencing medals, that are either cut or unused in the final game. Though there are more lines than these, those chosen would likely have had a medal if used.