Ossi2k

Kneel Discover all 30 Altars
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Sounds Of Animals Fighting Wear all masks at least once

The Sampler Platter Kill a Necromorph with every Weapon in the game (single player only).

Brothers in Arms Join another game through the matchmaking system.

A-MAZE-ing Survive Bomb Voyage's maze during ''The Golden Years'' without taking damage

Operation Trace Kill Complete Operation Trace Kill.

Top Gun Complete all Jackal-only side missions.

Page Turner Reveal every storybook page in the game.

A Dish's Worst Enemy Shatter 100 plates in Skeet Shoot.

Courier Service You completed all 10 package delivery jobs.

Autojock Buy all vehicles available for purchase.

Tar-up Drown 5 Enemies in Oil during Combat
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Up Close & Personal Perform 500 Melee Kills

Headhunting Complete "Headhunting"

Mine Alley Throw 5 Balls into the mineshaft in Creaky Canyon Alley Ball Challenge.

All Fall Down Destroy Gravitron 2

Pretty Red Balloons Pop 100 balloons in Balloon Blast.

Hack And Slash Hit a multi-slash asteroid 20 times in Cosmic Slash n' Defense.

V for Vendetta After reviving with Second Heart, kill or incapacitate the enemy who killed you within 5 seconds.

Bird watching Kill an helicopter's pilot with any weapon.

Pinpoint - Kill the Heavy with an StA-14 Killed the Heavy using the StA-14 rifle

Royal Flush All SDF Aces and Captains killed.

That Was Totally Wicked! Achieve a 75 hit combo

Flower Power Pop every pink flower balloon at least once in Flight of the Balloons.

Chapter VII Survive the encounter with Laura

Crossbow Kill First Kill with the Crossbow

The Quick and the Dead Kill or incapacitate 50 enemies while time is slowed.

Basket Case Score 15,000 points by popping basket balloons in Hot Air Balloon Show.

Senior Citizens Arrest Defeat a district boss with a Senior Citizen

Been Everywhere, Done It All Reach Accolade level 20.
5/20

4-in-a-Row, All-in-One-Go! Break all the plane plates in a single pass in Moving Target Madness.

A Game A Day Keeps The Doctor Away Play LittleBigPlanet™2 on every day of the week

Flag Burning Clear your first Bandit Camp.

Lost Property No crimefighter should be without this

The Nightmare Ends Finish the game saving Rebecca and Jill using Chris.

DLC: Mars: Nick's Story Complete the game (Host Only).

Efficient Killer Quick Killed 20 enemies

Your Own Kind of Incredible Extinguish the fires during ''Screenslaver Showdown'' without the Family Build

Can't Touch This! Kill 20 enemies in a row with melee weapons without taking damage.

DLC: Mars:Bug Squasher Perform 10 takedowns on Arachnids using the Power Glove.

Shock the Monkey Defeat Mechapon

Once More, With Feeling Finish the main story in New Game+ mode

DLC: Zombies: FertiliZer Kill 10 Gougers or Hot Heads with the tractor in Fields of Terror.

They're ALL My Favorite Purchase all Praetor Suit Perks in a single save slot

Peace to the Fallen Listened to all of the death letters of the fallen.

Chapter VIII Acquire the power of the second Dark Lord

I Saw, I Conquered Clear one Gauntlet in Raid Mode.

Social Discover all 16 Side Characters
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Partner Up Play through any booth with a friend in Adventure Mode.

Untouchable Complete ''Return to Nomanisan Island'' without being hit by a goo cannon