Find the Karma weapon.
Make Las Venturas Accessible
Read a terminal.
Defeat the Gum Wad
Take down 100 enemies who didn't know you were there
Killed 2000 enemies
Hit 100% of the notes in the solo of Can't Buy Me Love on Hard or Expert Guitar.
Defeat every Harry freeplay variant as Lord Voldemort
Perform melee finishers on 25 Creepers (single player only).
Thrash the Goathenge
Upgrade Imagination once
Your city has grown to size 20!
Respond correctly after someone does not
Raise any character's level to the maximum level
In Castle DLC matchmaking, disabled a vehicle and then hijack it.
Play 20 online ranked matches of any game type
Gained a Version (Level) for the first time
Defeat 50 Taken with the flaregun, the way Shakespeare intended.
Heal all Dinosaurs
At least 4 stars achieved on all special levels
Complete chapter 4 of episode 3.
Score more than 50 points in Downhill Dodge
Completed Chapter 4, Episode 5 of Spartan Ops without losing a generator on Heroic or harder.
Progress the story to unlock this achievement.
Unlock Prime Mode
Complete Episode 5: "No Time Left"
Master Vigilante Mode
Took a Russian Dog Tag in the forest ambush in Rock And A Hard Place
Acquire the Gold and Silver pipes.
Conquer Stage 6.
Get at least 7,000 points in a combat arena
Collect every Sub-Weapon
Stealth killed a noise distracted enemy
Defeated Justin the Supermutant!
Killed 10 enemies during 'Loud Sound'
Win a game having lost only 3 or fewer territories.
Throw the ball away on 4th down. Nice one.
Finish the Witness level in "Joe's Adventures."
Complete a Research Project.
Reached the bottom of The Cave.
Find the first health expander
Earned a Killing Spree in multiplayer Matchmaking.
Win 15 dynamic freeway races.
Complete 14 songs in Quickplay
Master the Double Sword technique!
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