Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Listener (5 points): Found the first Audio Log.
Kikowani Station (30 points): Completed Kikowani Station on Normal, Heroic or Legendary.
Data Hive (50 points): Completed Data Hive and unlocked the Chasm Ten Firefight mission.
Kizingo Boulevard (30 points): Completed Kizingo Blvd. and unlocked the Mickey character in Firefight.
ONI Alpha Site (30 points): Completed ONI Alpha Site and unlocked the Alpha Site Firefight mission.
NMPD HQ (30 points): Completed NMPD HQ and unlocked the Romeo character in Firefight.
Campaign Complete: Legendary (100 points): Completed Legendary and unlocked the Dare character in Firefight.
Junior Detective (10 points): Found the first clue unravelling the mystery.
Gumshoe (10 points): Found the 3rd clue unravelling the mystery, alone or with another ODST.
Coastal Highway (50 points): Completed Coastal Highway and unlocked the Last Exit Firefight mission.
Campaign Complete: Normal (100 points): Completed the Campaign on Normal difficulty.
Campaign Complete: Heroic (100 points): Completed the Campaign on Heroic difficulty.
Boom, Headshot (5 points): Got 10 automag headshot kills in any level.
Stunning! (5 points): Stunned a vehicle with an overcharged plasma pistol and quickly killed the driver.
Ewww, Sticky (5 points): Got 5 sticky grenade kills in any level.
Heal Up (5 points): Found the first Medical Kiosk and healed yourself.
Tourist (5 points): Accessed and downloaded the city map to your VISR.
Dark Times (5 points): Killed 5 enemies while using VISR mode.
Headcase (5 points): Finished any level with at least one Skull activated.
Tayari Plaza (30 points): Completed Tayari Plaza and unlocked the Buck character in Firefight.
Uplift Reserve (30 points): Completed Uplift Reserve and unlocked the Dutch character in Firefight.
My Clothes! (5 points): Plasma Pistol Overcharged and quickly killed 10 Brutes.
Pink and Deadly (5 points): Got 10 Needler supercombine kills on any covenant.
Trading Down (5 points): Traded weapons with a fellow character
Firefight: Security Zone (10 points): Scored over 200,000 points in Firefight on Security Zone.
Firefight: Alpha Site (10 points): Scored over 200,000 points in Firefight on Alpha Site.
Firefight: Rally Point (10 points): Scored over 200,000 points in Firefight on Rally Point.
Firefight: Crater (10 points): Scored over 200,000 points in Firefight on Crater.
Firefight: Lost Platoon (10 points): Scored over 200,000 points in Firefight on Lost Platoon.
Firefight: Windward (10 points): Scored over 200,000 points in Firefight on Windward.
Vidmaster Challenge: Endure (25 points): In Firefight, on any mission, passed the 4th Set on 4-player Heroic LIVE co-op.
Vidmaster Challenge: Deja vu (25 points): Completed Highway on 4-player Legendary LIVE co-op, with Iron, and no Hog or Scorpion.
Vidmaster Challenge: Classic (25 points): Finished any level solo on Legendary, on LIVE, with no shots fired or grenades thrown.
Firefight: Chasm Ten (10 points): Scored over 200,000 points in Firefight on Chasm Ten.
Firefight: Last Exit (10 points): Scored over 200,000 points in Firefight on Last Exit.
Be Like Marty (10 points): In Firefight, finished a full round without killing a single enemy.
Laser Blaster (5 points): Got 10 Spartan Laser kills on ONI Alpha Site.
Dome Inspector (5 points): Got 15 headshot kills on NMPD HQ.
Both Tubes (5 points): Got 10 Rocket kills on Kizingo Boulevard.
Super Sleuth (10 points): Found the final clue unravelling the mystery, alone or with another ODST.
Wraith Killer (5 points): Killed all Wraiths in Uplift Reserve
I Like Fire (5 points): Killed 10 enemies with the Flamethrower on Data Hive.
All Ears (30 points): Found 15 Audio Logs, alone or with another ODST.
Audiophile (75 points): Found all Audio Logs, alone or with another ODST.
Tuned In (15 points): Found 3 Audio Logs, alone or with another ODST.
Good Samaritan (20 points): Killed no Engineers in the city at night during entire campaign, alone or with another ODST.
Naughty Naughty (5 points): Killed 10 Engineers in the city at night, alone or with another ODST.