Battlefield 3 soldier in multi...
	Easy experience points...
	Passing out in Purgatory...
	The Hunt For Red October refer...
	The origin of the boy...
	Various Steam Achievements...

Link a Battlefield 3 Online Pass to your EA account.

When you find a Medi-Gel container when already at maximum capacity for them, you will instead receive a number of experience points that varies according to the difficulty setting. Before collecting the contain,er enter the settings and increase the difficulty. Collect the container to get the extra experience points, then change the difficulty back to its previous setting.

When in Purgatory, go to the bar and have a drink. Then, have another one and one more after that (three total without leaving). You will pass out and wake up moments later, in Purgatory.

During the introduction sequence for the mission where you are about to land on Rannoch, Commander Shepard is standing in the Normandy's bridge talking to Joker about the fact that there sure a lot of enemies out there. Joker laughs it off and says that with the Normandy's stealth drive engaged, the only way for the Geth to notice you is if you all start singing the Russian national anthem. This is a direct reference to the 1990 film, The Hunt For Red October.

At the beginning of the game, when you are fleeing Earth, you can see the child you will eventually talk to running away from Husks. Before you get to the part where you see Husks climbing up the wall (the first time you shoot at something), you can see the boy looking below, looking over the railing. When the Husks arrive and Anderson coaxes you to shoot them, continue to observe the boy run into the building and lock the door. The building is blown up seconds later, but he apparently survives in the vent.

Complete the indicated task to unlock the achievement.

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