Mass Effect 3 Cheats - Xbox 360

Achievements
Complete the following achievements to unlock Xbox Live Gamerscore points:

A Personal Touch (10) - Modify a weapon.
Driven (5) - Return to active duty.
Enlisted (5) - Start a character in multiplayer or customize a character in single-player.
Executioner (25) - Defeat an old adversary.
Explorer (15) - Complete three multiplayer matches or five N7 missions.
Eye of the Hurricane (10) - Kill a brute while it's charging you.
Fact Finder (15) - Discover an enemy's monstrous origin.
Focused (25) - Evolve any of your powers to rank 6.
Giant Killer (10) - Defeat a harvester.
Almost There (15) - Reach level 15 in multiplayer or level 50 in single-player.
Always Prepared (10) - Obtain two non-customizable suits of armor.
Arbiter (25) - Win a political stand-off.
Battle Scarred (25) - Promote a multiplayer character to the Galaxy at War or import an ME3 character.
Bringer of War (10) - Chase down an assassin.
Bruiser (10) - Kill 100 enemies with melee attacks.
Combined Arms (25) - Perform any combination of 50 biotic combos or tech bursts.
Defender (25) - Attain the highest level of readiness in each theater of war.
Lost and Found (25) - Dispatch 10 probes to retrieve people or resources in Reaper territory.
Mail Slot (10) - Kill 10 guardians with headshots from the front while their shields are raised.
Master and Commander (50) - Deliver most of the Galaxy at War assets to the final conflict.
Mobilizer (15) - Bring a veteran officer aboard.
Overload Specialist (15) - Overload the shields of 100 enemies.
Paramour (25) - Establish or rekindle a romantic relationship.
Party Crasher (15) - Sabotage a dreadnought.
Pathfinder (15) - Explore a lost city.
Patriot (25) - Make the final assault.
Gunsmith (25) - Upgrade any weapon to level 10.
Hard Target (15) - Call down an orbital strike.
Hijacker (10) - Hijack an Atlas mech.
Insanity (75) - Finish the game on Insanity without changing difficulty after leaving Earth.
Last Witness (25) - Extract ancient technology.
Legend (50) - Mission accomplished.
Liberator (15) - Stop a Cerberus kidnapping.
Long Service Medal (50) - Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
Sky High (15) - Lift 100 enemies off the ground with powers.
Soldier (15) - Kill 1,000 enemies.
Tour of Duty (20) - Finish all multiplayer maps or all N7 missions in single-player.
Tourist (5) - Complete one multiplayer match or two N7 missions.
Peak Condition (25) - Reach level 20 in multiplayer or level 60 in single-player.
Problem Solver (15) - Evacuate a scientific facility.
Pyromaniac (15) - Set 100 enemies on fire with powers.
Recruit (10) - Kill 250 enemies.
Saboteur (15) - Disable a group of fighter squadrons.
Shopaholic (10) - Visit a store in the single-player campaign.
Tunnel Rat (15) - Survive the swarm.
Untouchable (10) - Escape a Reaper in the galaxy map.
Unwavering (50) - Finish all multiplayer maps on Gold or all single-player missions on Insanity.
Veteran (25) - Kill 5,000 enemies.
Well Connected (15) - Send a warning across the galaxy.
World Shaker (15) - Destroy an Atlas dropped from orbit.

Additionally, there are two From Ashes DLC achievements:

Freedom Fighter (25) - Find all required intel to help Eden Prime's colonists.
Prothean Expert (25) - Learn more about the Prothean Empire.

Unlock Avatar Awards
N7 Helmet - Return to Active Duty.
Omniblade - Kill 25 Enemies with Melee Attacks.

Unlock Battlefield 3 Soldier
Have a Battlefield 3 Online Pass Linked on your EA account.