Achievements
Finish the achievements listed below to access Xbox Live Gamerscore points.

Green as Grass (10 points): Train the rook (any difficulty).

It's a Trap! (10 points): Story progression in Act 1, Chapter 2.

Escort Service (10 points): Story progression in Act 1, Chapter 4.

Girl About Town (10 points): Story progression in Act 1, Chapter 6.

That Sinking Feeling (10 points): Story progression in Act 2, Chapter 4.

Freebaird! (10 points): Story progression in Act 2, Chapter 5.

Heartbroken (10 points): Story progression in Act 2, Chapter 6.

Longitude and Attitude (10 points): Story progression in Act 3, Chapter 3.

Tanks for the Memories (10 points): Story progression in Act 3, Chapter 4.

Water Sports (10 points): Story progression in Act 3, Chapter 6.

There's a Time for Us (10 points): Story progression in Act 4, Chapter 2.

Better Wrapped in Beacon (10 points): Story progression in Act 4, Chapter 3.

Have Fun Storming the Castle (10 points): Story progression in Act 4, Chapter 6.

And the Horse You Rode in On (10 points): Story progression in Act 5, Chapter 1.

You Are the Support, Son (10 points): Story progression in Act 5, Chapter 2.

Brumak Rodeo (10 points): Story progression in Act 5, Chapter 4.

Does This Look Infected to You? (10 points): Story progression in Act 5, Chapter 5.

Tourist of Duty (25 points): Complete all campaign acts on Casual Difficulty.

Guerilla Tactician (50 points): Complete all campaign acts on Normal Difficulty.

Artist of War (75 points): Complete all campaign acts on Hardcore Difficulty.

Suicide Missionary (150 points): Complete all campaign acts on Insane Difficulty.

Collector (5 points): Recover 5 collectibles (any difficulty).

Pack Rat (15 points): Recover 20 collectibles (any difficulty).

Completionist (30 points): Recover all 41 collectibles (any difficulty).

One-Night Stand (10 points): Complete 1 chapter in co-op on any difficulty (Marcus or Dom).

Open Relationship (30 points): Complete 10 chapters in co-op on any difficulty (Marcus or Dom).

Friends with Benefits (50 points): Complete all acts in co-op on any difficulty (Marcus or Dom).

Once More, With Feeling (10 points): Perform 30 perfect active reloads (any mode).

Takes a Licking (30 points): Melee 30 Tickers (any mode).

Organ Grinder (10 points): Kill 30 enemies with a cover mounted Mulcher (any mode).

Shock and Awe (10 points): Kill 30 enemies with the heavy Mortar (any mode).

Said the Spider to the Fly (10 points): Kill 10 enemies with a planted grenade (any mode).

Crowd Control (10 points): Melee 10 enemies down with the Boomshield equipped (any mode).

Smells Like Victory (10 points): Kill 30 enemies with the Scorcher Flamethrower (any mode).

Variety Is the Spice of Death (30 points): Kill an enemy with every weapon in the game (any mode).

Seriously 2.0 (50 points): Kill 100,000 enemies (any mode).

Standing Here, Beside Myself (10 points): Win 3 matches of Wingman (public).

Beat the Meatflag (10 points): Capture 10 meatflags in Submission (public).

It's Good to be the King (10 points): Win 10 rounds of Guardian as the leader (public).

You Go Ahead, I'll Be Fine (10 points): Win three matches of King of the Hill (public).

Back to Basic (10 points): Successfully complete the 5 lessons of multiplayer Training Grounds.

Party Like It's 1999 (30 points): Play 1999 rounds of multiplayer (any mode).

Around the World, Again (30 points): Win a multiplayer match on each map (any mode).

Dirty, Dirty Horde (20 points): Survive the first 10 waves of Horde (any difficulty, any map).

Hoard the Horde (30 points): Survive all 50 waves of Horde (any difficulty, any map).

Crossed Swords (10 points): Win 10 chainsaw duels (any mode).

A Parting Gift (20 points): Kill 10 enemies with a grenade while down but not out (any mode).

Pound of Flesh (10 points): Use a meatshield to save your life 10 times (any mode).

Photojournalist (10 points): Submit a spectator photo.

Kick 'Em When They're Down (10 points): Perform all 11 unique executions on a downed enemy.

Multi-player mode skins
Finish the listed task to access the matching skin for Multi-player mode.

Anthony Carmine: Complete Act 1 in the original Gears Of War (have any Act 1 achievement unlocked from that game).

Dizzy Wallin: Complete Act 1 in Single Player mode.

Flame Grenadier: Complete Act 4 in Single Player mode.

Kantus: Complete Act 2 in Single Player mode.

Lt. Minh Young Kim: Find 10 COG tags in the original Gears Of War (have the "Time To Remember" achivement unlocked from that game).

RAAM: Defeat RAAM in the original Gears Of War (have the "A Dish Best Served Cold" achievement from that game).

Skorge: Complete Act 5 in Single Player mode.

Tai Kaliso: Complete Act 3 in Single Player mode.

Insane difficulty
Finish the game completely.