Wake up 10 Campaign Mission Completion
A history of decimation 10 Campaign Mission Completion
Dominated 10 Campaign Mission Completion
Guerilla tactics 10 Campaign Mission Completion
Stirring the pot 10 Campaign Mission Completion
All travel is suspended 10 Campaign Mission Completion
Behind enemy lines 10 Campaign Mission Completion
The setup 10 Campaign Mission Completion
And the knockout punch 10 Campaign Mission Completion
Fifth Floor: Tools, Guns, Super Weapons 10 Campaign Mission Completion
Sentinel size matters 10 Campaign Mission Completion
Last stop, this town 10 Campaign Mission Completion
Learn the ropes 10 Complete the Basic standalone tutorial
Know the ropes 10 Complete the Advanced standalone tutorial
Two heads are better than 10 Complete a Campaign mission in Co-op
This war is over 30 Complete the Campaign
The hard fight 40 Complete the Campaign on Heroic
Surviving the long war 60 Complete the Campaign on Legendary
Gold rush 20 Earn a gold medal on any mission (except Prologue) on any difficulty
Palmer's Pure Gold 30 Earn a gold medal on every mission (except Prologue) on any difficulty
Lone Wolf 40 Complete any mission (except The Signal) solo on Legendary with all skulls activated
Comrades in Arms 20 Earn a gold medal on any mission (except Prologue) in Co-op on Legendary
A little bit extra 10 Complete half of the Campaign bonus objectives
A lot extra 20 Complete all the Campaign bonus objectives
Alas, poor Yorick! 10 Collect a Skull
Morbid curiosities 20 Collect half of the Skulls
Collecting a dream 30 Collect all the Skulls
The Scrappy Six 20 Complete a matchmade multiplayer match as each of the starting 6 leaders
First steps 10 Complete a matchmade multiplayer match
Natural intelligence 10 Win a Skirmish Match against only AI opponents (1 or more)
Two heads are better than none 10 Win a Skirmish Match with a friend against only AI opponents (2 or more)
You've got a case of the Birley 20 In a Skirmish Match against Legendary AI, recycle your base in the first 5 minutes and then win
The rank and file 10 Recruit or construct 1 of each UNSC unit in Multiplayer or Skirmish (Launch units only)
The tribe 10 Recruit or construct 1 of each Banished unit in Multiplayer or Skirmish (Launch units only)
Trash compactor 20 Destroy 100 Vehicles with Anti-Vehicle Units (Multiplayer, Skirmish or Blitz)
Flyswatter 20 Destroy 100 Air units with Anti-Air Units (Multiplayer, Skirmish or Blitz)
Meat grinder 20 Kill 100 Infantry with Anti-Infantry Units (Multiplayer, Skirmish or Blitz)
Spare change 10 Spend 5 Leader Points in Multiplayer or Skirmish
Big spender 30 Spend 100 Leader Points in Multiplayer or Skirmish
Space healer 30 Cast 100 healing Leader Powers (Multiplayer, Skirmish or Blitz)
Overkill 30 Destroy 500 units with Leader Powers (Multiplayer, Skirmish or Blitz)
The hand that feeds 20 Secret Achievement
Making the most of the day 10 Complete 3 Daily Challenges in one day
A strong showing for the week 10 Complete a set of 3 Weekly Challenges
Short-term commitment 20 Complete at least 1 Daily Challenge each day for a week
Long-term commitment 30 Complete at least 1 Weekly Challenge each week for a Month
Duellist 10 Win your first Blitz match
Ante-up 10 Complete the Blitz tutorial
Card shark 20 Play 25 matches of Blitz
Full house 10 Play Blitz as each of the 6 starting leaders
All or nothing 10 Play all of the cards in your deck at least once in a single Blitz match
Stacked the chips 10 Gather 150 energy crates over any number of matches
Jackpot 40 Play 777 total cards over any number of matches
Firefighter 10 Beat wave 10 in Blitz Firefight
It just keeps going 30 Beat wave 25 in Blitz Firefight
On fire 20 Score 500,000 points in a single Blitz Firefight
Paint it red 10 Achieve the highest possible kill-streak in any Blitz mode (Blitz or Firefight)
Only real stinkers are the Challenge and Blitz related ones for me. Really don't want to play Pay 2 Win Blitz.