I have mastered:
Boltshot (sorry guys)
DMR
Sniper
Sticky det
Rockets
Shotgun
First strike
Perfection
Scattershot
Spartan Slayer
Bullet to the brain
Spartan Spree
Multikill
Hail of Death
Protector
Exterminator
Combat opportunity
Captured
Slayer high score
kingslayer
Base Defense
Banshee destroyer
Elite officer slayer
Interesting thread : )
Battle Rifle
DMR
Sniper Rifle
Shotgun
Sword
Fuel Rod
Scattershot
Turrets
Spartan Slayer
Bullet to the Brain
Multikill
Spartan Spree
First Strike
Assassin
Assistant
Protector
Combat Opportunity
Avenger
Hail of Death
Perfection
Exterminator
All the Campaign Commendations
Jackal Ranger Slayer
Elite Officer Slayer
Elite General Slayer
Splatter
Wheelman
Warthog Destroyer
Ghost Destroyer
Banshee Destroyer
Wraith Destroyer
Slayer High Score
Kingslayer
Captured
-Yoink- this is going to be a long thread of long posts 
Impressive. I have no idea how to master assassin, I’m still @ adept.
> Impressive. I have no idea how to master assassin, I’m still @ adept.
SWAT, there’s no radar and on maps like Haven you can just pop up right behind the enemy.
None.
“Impressive. I have no idea how to master assassin, I’m still @ adept”.
Honestly, you can play a whole bunch of different playlists. I did mine in Infinity Slayer, Big Team, Oddball and Team and FFA Regicide.
Camo is recommended and AA Efficiency or Mobility will help, and you might consider the Wetwork bonus if it doesn’t interfere with something else.
I don’t recommend SWAT, personally, but that could be worth a try.
Practice makes better too. At the start I was getting an Assassination every two games, but it topped out at the end at six each game.
All Player commendations are mastered.
All UNSC weapons are mastered.
All Forerunner weapons are mastered except the light rifle.
All Oddball commendations are mastered.
Elite officer commendations is mastered.
Splatter commendation is mastered.
Banshee destroyer is mastered.
A lot of random gametype commendations are mastered.
I don’t play much at all anymore or I’d have more stuff mastered.
I’m having more fun playing Happy Wars than this horribly broken game.
Just all the ones that unlock this awesome stance 
> Impressive. I have no idea how to master assassin, I’m still @ adept.
Slayer Pro was by far the easiest way to get it. This playlist doesn’t exist anymore however.
> “Impressive. I have no idea how to master assassin, I’m still @ adept”.
>
> Honestly, you can play a whole bunch of different playlists. I did mine in Infinity Slayer, Big Team, Oddball and Team and FFA Regicide.
>
> Camo is recommended and AA Efficiency or Mobility will help, and you might consider the Wetwork bonus if it doesn’t interfere with something else.
>
> I don’t recommend SWAT, personally, but that could be worth a try.
>
> Practice makes better too. At the start I was getting an Assassination every two games, but it topped out at the end at six each game.
I’ll give it a shot 
> Just all the ones that unlock this awesome stance
Haha I’m going for that right now
> All Player commendations are mastered.
> All UNSC weapons are mastered.
> All Forerunner weapons are mastered except the light rifle.
> All Oddball commendations are mastered.
> Elite officer commendations is mastered.
> Splatter commendation is mastered.
> Banshee destroyer is mastered.
> A lot of random gametype commendations are mastered.
>
> I don’t play much at all anymore or I’d have more stuff mastered.
> I’m having more fun playing Happy Wars than this horribly broken game.
Wow, impressive.
Easier to list what I dont have…
weapons - all unsc but railgun
player - all but beatdowns & perfection
enemies - 11/19
vehicles - all but mongoose & scorpion
gametypes - all flag, all dominion, 2/4 oddball, 1/3 regicide
campaign - all
Spartan slayer, assistant, hail of death, exterminator, all campaign missions, elite officer, elite general, crawler prime, knight, backstab, knight battlewagon, banshee destroyer, kingslayer.
Not bad considering I only have a three hour time slot to play everyday.
DMR
Bullet in the Brain
Spartan slayer
Exterminator
Hail of death
combat opportunity
Assistant
King Slayer
Slayer High Score
Captured
Splatter
Spartan Slayer
Hall of Death
Assassin
Exterminator
Campaign
Hunter Slayer
Grunt Ultra Slayer
Grunt Imperial Slayer
Jackal Ranger Slayer
Elite Zealot Slayer
Elite Officer Slayer
Elite General Slayer
Elite Slayer
Crawler Prime Slayer
Backstab
Wraith Destroyer
Banshee Destroyer
Wheelman
No weapons sadly…YET!
Battle Rifle
Plasma Grenades
Splatter
Sniper Rifle
Hail of Death
Spartan Slayer
Exterminator
Slayer High Score
> All Player commendations are mastered.
> All UNSC weapons are mastered.
> All Forerunner weapons are mastered except the light rifle.
> All Oddball commendations are mastered.
> Elite officer commendations is mastered.
> Splatter commendation is mastered.
> Banshee destroyer is mastered.
> A lot of random gametype commendations are mastered.
>
> I don’t play much at all anymore or I’d have more stuff mastered.
> I’m having more fun playing Happy Wars than this horribly broken game.
I don’t get how you can play that much, and then call it horribly broken.
A lot.
The three I am most proud of is BR Master, Sniper Rifle Master, and Magnum Master.
Very close to LightRifle Master, now.
After the LightRifle will be the Carbine.
Weapons 40%