Halo: Reach

As an Elite, kill 5 Spartan players in Matchmaking.

Halo: Reach

Advance any Commendation to its Silver state.

Halo: Reach

Complete a Weekly Challenge.

Halo: Reach

Score 15,000 points in Score Attack Firefight Matchmaking.

Saints Row: The Third

Complete Act 3 in another way.

Saints Row: The Third

Complete Act 1 in another way.

Saints Row: The Third

Create and share a character online.

Halo: Reach

Complete all of the Daily Challenges in a given day.

Halo: Reach

Noble 1: Earn a Double Kill with the shotgun in multiplayer Matchmaking.

Gears of War 3

Survive all 12 waves of Beast mode (any difficulty, any map).

Gears of War 3

Reach level 25.

Gears of War 3

Kill 10 enemies in Team Deathmatch (Standard or Casual).

Gears of War 3

Execute an Epic employee, or someone who already has Lambency, in Versus multiplayer (any mode).

Gears of War 3

Demonstrate your skill in Casual Versus multiplayer.

Fight Night Champion

Turn pro in Legacy Mode

Fight Night Champion

Defeat Kobe Nichols in Champion Mode

Fight Night Champion

Defeat Meldrick Johnson in Champion Mode

Fight Night Champion

Knockdown Mason Brooks in under 3 minutes in Champion Mode

Red Dead Redemption

Kill 500 enemies with any rifle, repeater, or shotgun in any game mode.

Red Dead Redemption

Kill a Rockstar or someone with this achievement in a public multiplayer match.

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Beat a Rank 50 player

Assassin's Creed II

Tint your clothes with those colors: Wetland Ebony and Wetland Ivory.

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Choose any Friend as a Rival from the Single Player Leaderboards

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Become an Award-winning racer

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Race at each location in the game

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Wreck a Blur developer on Xbox LIVE, or anyone with this Achievement

Gears of War 2

Melee 30 Tickers (any mode)

Gears of War 2

Earn enough multiplayer experience to reach level 5 (not Custom)

Tom Clancy's Rainbow Six: Vegas 2

Complete 5 scenes as Bishop's teammate, Knight, in co-op Story mode at any difficulty.

Tom Clancy's Rainbow Six: Vegas 2

Complete a scene as Bishop's teammate, Knight, in co-op Story mode at any difficulty.

Call of Duty: World at War

In the final battle for Okinawa, save Sergeant Roebuck. (Solo or co-op)

Call of Duty: World at War

Kill 10 enemies while the lights are out in the subway in 'Eviction'. (Solo or co-op)

Call of Duty: World at War

Complete a match in Campaign Co-Op mode over Xbox LIVE. (Online co-op only)

Gears of War 2

Kill 10 enemies with a planted grenade (any mode)

Gears of War 2

Melee 10 enemies down with the Boomshield equipped (any mode)