Conduit 2

Unlock the corresponding achievement, by completing the indicated task!

Remember where the Green Ooze Achievement thing was in D.C.? Well there is a blue thing there that you scan to get the map to Crash Site (an online multiplayer map).

Walk in a circle in the main room of Atlantis with ASE and scan all scan-able items to unlock Dark Star and some armor upgrades.

Invasion Mode (under Splitscreen on the main menu) is great for playing with your friends, but it can also be used to earn a plethora of Credits. Here's a great strategy for doing so (you'll earn about 30,000 credits per hour).

You'll need the following: Widowmaker Turret; Widowmaker Turret specialization; A secondary Weapon you can use to take out the enemies (the MP5 or HVS).

Recommended: Metal Legs, Quickness, Frag Grenades, Improved Ballistics Damage.

Basically, this strategy is about finding a corner where none of the enemies can spawn directly next to you in, setting up your automatic turret and picking off enemies easily. It works best in Siberia, but can be applied to any map. Just find a spot on the map with the following: No Enemy Spawns directly next to it; A safespot you can duck into when you get low on Health; Cover; A clear angle on enemies without to much stuff in the way, as flat as possible.

There's one corner of Siberia down a hill that's great for this, the Turret automatically takes down enemies right as they spawn. Just let it fire and use your secondary weapon to take down the ones it's not firing at. Grab an enemy SCAR or Hive Cannon at some point in the match to use, be sure to chase after the Big coins (1,000 coins is what you get from an average 10 minute WiFi match) and bonus caches. This strategy will EASILY get you through the first 3 or 4 waves, then it gets tougher. Be sure to watch out for the Robotic Dogs attacking your turret, Skimmers (the flying guys, your turret can't take those out), anything with Explosives, especially those SMAW guys), and the suicide bombers. This should get you a quick 10k-30k credits if executed correctly.

In the Washing D.C. level go to the trailer and fall down the ladder to the sewer. After killing to two mites in the room, aim your reticule at the canister of Green Ooze with tiny footprints going into the sewer water and you'll unlock the Green Ooze Achievement. There is also a Conspiracy Object in that room.

From the Atlantis hub program, the Conduit to take you to Oxford University. As soon as you arrive look to the right. There should be a rock pillar that you can jump to. Do so, and in the middle of it will be a scannable object. Use the ASE and you will be given the blueprints for the ever-useful Hive Cannon.

When you get the map for Serenity, go to a building with a portal in it and a bunch of alien Drones will come out of it. Here is a list of weapons to do this.

MP5K-A4 Sub-Machine gun
SCAR Assault Rifle
SMAW Rocket Launcher
SPAS 12 Shotgun
Strike Rifle
USP45 Pistol

Like I told, go into a room with a portal in it. A Drone will come out. Use your close up/scope mode with one of the weapons. Kill it, go out of the building, go in again, and then another Drone will come. Do that over and over and over again until you are tired and want to get back. Use the ASE on the portal you came out of to get here and go through the portal to get back to Atlantis.

In order to get this map you have to go to Siberia. In the place where you find Katarina, walk until you get to the room with the two staircases on the right and the left. Go up any staircase and, once you get to the top and destroy the enemies, go to the very right and crouch down. Go into the hole, scan the blue object, and you will get the map to Precipice, an online multiplayer map. Also there is a blueprint for the TPC Launcher in a different room in Siberia.

In the Extras option, go to Promotional Codes and type one of the following codes in.

When you are in China, go to the room where you find the elemental doors. As soon as you arrive, look up and look to the right a bit. There is a ledge that you have to get to. Go into the water element room. Once you get the element and destroy the enemies, you realize that the door that was locked when you went up the staircase is unlocked! Go through the door and go to the very end of the ledge. Scan the blue object and finally you will get the map to go to Serenity (the china online multiplayer place).