List of Halo 5: Guardians commendations/Game mode

Warzone Mastery
Master all Warzone commendations. Reward: 2500 XP + 1 Requisition Pack

Arena Mastery
Master all Arena commendations. Reward: 5000 XP + 1 Requisition Pack

Flag Mastery
Master all Capture the Flag commendations. Reward: 2500 XP + 1 Requisition Pack

Warzone Firefight Mastery
Master all Warzone Firefight commendations. Reward: 2500 XP + 1 Requisition Pack

Stronghold Mastery
Master all Strongholds commendations. Reward: 2500 XP + 1 Requisition Pack

Breakout Mastery
Master all Breakout commendations. Reward: 2000 XP + 1 Requisition Pack

Slayer Mastery
Master all Slayer commendations. Reward: 2000 XP + 1 Requisition Pack

Hunter
Kill a boss or assist on the kill of a boss in Warzone

Big Game Hunter
Kill an ultra boss or assist on the kill of an ultra boss in Warzone

Assistant
Earn any Assist medal in Warzone

Conqueror
Conquer a base

Carrier Takedown
Kill an enemy flag carrier in any Capture the Flag gametype in matchmaking

Mine!
Return your team's flag in any Capture the Flag gametype in matchmaking

Defender of the Flag
Protect your team's flag in any Capture the Flag gametype in matchmaking

Flag Victory
Win a match in any Capture the Flag gametype in matchmaking

Storm the Walls
Take over any base in any Stronghold gametype in matchmaking

Head in the Game
Defend a team base in any Stronghold gametype in matchmaking

Aggressive Expansion
Take over 3 bases without dying in any Stronghold gametype in matchmaking

Stronghold Victory
Win a match in any Stronghold gametype in matchmaking

Against All Odds
Win a round of any Breakout gametype while outnumbered in matchmaking

Unstoppable
Survive a full match of Breakout

Breakout Victory
in any Breakout gametype in matchmaking

Bulldozer
Finish with KDA over 8 in any Slayer gametype in matchmaking

Wonderful Toys
Pick up three or more weapons or powers during a single match in any Slayer gametype in matchmaking

Slayer Victory
Be on the winning team of a Slayer match

Warzone Firefight Covenant Slayer
Kill any Covenant in a Warzone Firefight Match

Warzone Firefight Promethean Slayer
Kill any Promethean in a Warzone Firefight Match

Warzone Firefight Boss Hunter
Kill a boss in a Warzone Firefight match

Warzone Firefight Victory
Win a match in any Warzone firefight game