Complete the following achievements to unlock Xbox Live Gamerscore points.

Complete the game on Normal to unlock the secrets

Complete the indicated task to unlock the corresponding bonus the next time a new game is started. Once the game is completed you can also use your existing character with previously earned equipment and skills.

Completing the game on the Hardcore and Insanity difficulties will unlock 2 special gamer pics for use on your profile.

Complete the Bring Down the Sky mission.

1.) First, fulfill the side quest involving Dr. Michel (from the Med Clinic) and her blackmailer. After the quest is complete, you'll get a discount from all of the goods she sells.

2.) Start selling her all of your expensive equipment. Then, travel to the Wards Markets and talk to the merchant named Expat. You can buy all of your stuff back for cheaper than you sold it off.

3.) Head back to Dr. Michel and sell off your stuff again. Repeat this process as much as you want for as much profit as you desire.

Complete each achievement to receive the allotted gamerscore.

When you are on the mission about the missing Marines you will encounter a large worm creature. To defeat it, jump just before the projectile acid the worm spits. Meanwhile, attack it with missiles (RB) and constant gunfire (RT) and it will soon fall.

The easiest way to defeat the Thresher Maw is after it has initially launched out of the ground to drive off, stay at a relative distance and drive circles around it while firing. Because of your distance, it will not use its long-ranged attack or be able to cause melee damage. It will go back underground after a time or certain amount of damage is inflicted and will change location where it pops up. Repeat the circular attack and you will get away undamaged.

Create an Adept character so that you will have the following skills:

Lift
Throw
Warp
Singularity
Barrier
Stasis

You should use those skills 75 times each to unlock the individual achievements for them (15GS each).

The easiest way to do this is by targeting the Citadel Rapid Transport Stations or the Mako and using those powers over and over again. Use Adrenaline Rush as well to recharge the skills faster. Keep on doing this until you unlock the achievements.

Create an Engineer Class character.

Use this skill on Citadel Rapid Transports or the Mako. Keep on doing this until you unlock the achievement.

Using either an Engineer or Adept class characters, keep on using Overload and Sabotage on Citadel Rapid Transports or the Mako over and over again until the achievements are unlocked.

When traveling using the Mako, defeat enemies on foot instead to receive more experience points.

In the ExoGeni facility there are several claws that feed power that must be terminated to continue the mission. You will come across a control panel for the Shuttle Bay Door Controls. This panel has 5 switches of different pressures:

(5 PSI Valve) (7 PSI Valve) (17 PSI Valve) (11 PSI Valve) (13 PSI Valve)

The objective is to add just enough pressure to fill the gauge between the two arrows. Too much will reset the puzzle and you will have to play with different combinations. Once a correct pressure is reached the bar will turn yellow and text under it will read "WARNING, HIGH PRESSURE". Enter 7, 11, and 13, then activate. This will create enough pressure to break the claw and deactivate the Geth power being flushed into ExoGeni.

On the planet Noveria you must solve a puzzle after you enter the Core at Mira to restore activity to the compound. The solution is as follows. There are three columns. Four discs are in the left column. You must move all four discs to column two or three for the puzzle to be completed. "1" indicates the upper most ring, "4" is the lowest, etc.

Step 1:
Move 1 to the middle.
Move 2 to the right.
Move 1 to the right on top of 2.
Move 3 to the middle.

Step 2:
Move 1 to the left.
Move 2 to the middle on top of 3.
Move 1 to the middle on top of 2.
Move 4 to the right.

Step 3:
Move 1 to the right.
Move 2 to the left.
Move 1 to the left on top of 2.
Move 3 to the right on top of 4.

Step 4:
Move 1 to the middle.
Move 2 to the right.
Move 1 to the right.

These steps will solve the puzzle with all four discs being in the right column.

Get a HMWA X assault rifle with Frictionless Materials, Combat Optics X, and Snowblind Rounds X as upgrades.

Use your rifle and strafe to avoid his rocket fire.

Have your crew and yourself use biotic powers everytime Saren stops to shoot (usually when he is hanging on the wall). Only do it once when he stops, otherwise you are wasting abilities.

Find a planet that has a Hazard level 1. Stand outside the Mako and keep pressing Y. Make a note of how many times you pressed [Heal]. If you do not pay attention and run out of Medi-Gel, you could die from the Hazard level.

Use the following trick to unlock all six ally achievements with only three playthroughs. When you start the game, focus on getting all six of your teammates. Choose two of them to play through the game with. Keep those two until you complete the majority of the game. You will get the ally achievement for the teammate you recruited first. After you get it, replace that teammate with another one as soon as possible. After the next assignment you complete, you will then unlock the ally achievement for the second teammate.

If you are a Soldier, level up weapons so you can use their bonuses and no further. For example, carnage is the shotgun's bonus. By doing this you will have extra points for a desired weapon and points to level everything else completely out. You do not need the damage and accuracy bonus from the points, because when you become a Spectre the best of every weapon becomes unlocked for you in the Normandy or at the C-SEC requisitions office.

If you are a Soldier, level up weapons so you can use their bonuses and no further. For example, carnage is the shotgun's bonus. By doing this you will have extra points for a desired weapon and points to level everything else completely out. You do not need the damage and accuracy bonus from the points, because when you become a Spectre the best of every weapon becomes unlocked for you in the Normandy or at the C-SEC requisitions office.

The best way to find the elements, minerals, and anomalies on planets that you can explore is to drive along the edges of the operational area (the red area). Drive the Mako in a circle around the area to where you can barely see the edge of the red line. You should find at least two elements/minerals on each planet that can be explored. There are rare things that will not show up on your map -- you will also have to drive around like this to find them. There are several more items than you are required to find, but it is good to go ahead and get them if you need the experience points. Also if you say the correct things to the Asari Consort, she will give you a trinket that will allow you to activate a Prothean Orb found on Eletania, or the "monkey" planet, in the Hercules system. It contains the memories of a Cro-Magnon that was observed by the Protheans. The orb will show up as an anomaly on your map, in the lower left corner.

Use the following trick when your Mako is badly damaged and you do not want to or cannot spend Omni-gel to repair it. Save the game and reload it. You will find that the Mako is now totally repaired.

Because of biowares horrible spans between checkpoints, save your game frequently when there are no enemies around or else you will end up being almost done with the level, die and end up at the beginning of the mission.

Are those nasty, ugly krogans ruining your day when the get back up after you filled them with plasma? try using incindiary or chemical rounds to ensure a good kill.

When you reach the Hercules System in the Attican Beta Cluster you will receive a mission to recover a "lost data pad" from the planet Eletania. Once you have found the data pad on one of the roaming local species(called a "monkey" in the game) in the mine you will be awarded approximatly 6+ paragon, save the game immediately. Once done, load the saved game and you should be able to continue to click on this monkey infinite amounts of times... I ran up my Paragon to 450+ points and, of course, received the achievement

When the mission starts head towards the highest mountain in the level, there should be a container, walk in and go to the front and press a to use radio. Music will start playing until you go off the mountain.

It is possible to take the Mako through the gap in between the two rocks, where you are supposed to get out and travel on foot. Drive in to the gap, then from inside the gap drive up the left rock, until you are completely on your side, wedged between both rocks. Slowly inch forward and use boosts to slide through the gap.

The geth and the walkers (the mini boss fight after the video) will not attack the Mako, and they die after only a couple of cannon shots.

On the planet Noveria, head to the hotel bar and look for a Turian named Lorik Quinn. Accept his quest to steal the data from his office. Once you get the data, the receptionist will ask you to get Quinn to testify. Tell her you'll do it, and then go talk to Quinn. From here:

1) Tell Quinn that he should testify (top left option).

2) When he refuses, select the Charm option (top left) for Paragon points or the Intimidate (bottom left) for Renegade points and end the conversation.

3) Talk to him again, and ask about the Matriarch.

4) When he gets done talking about her, select the "Other questions" option (bottom right).

5) Now, you'll have the option to ask him to testify again (top left). He'll refuse, and you'll be able to use the Charm or Intimidate option again to gain another 24 Paragon or Renegade points.

Repeat steps 3-5 until you have all the Paragon or Renegade points you want.