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How to Be Sure You and Your Squad Survive SPOILERS
Your choices during the Final part of the game are largely irrelevant so long as who you choose for each role makes sense. For example when you need a powerful biotic don't use someone who is a split specialization. Otherwise make sure you buy the shields, armor, and weapon upgrades for the Normandy or you won't last long. Also make sure you complete all of your squads personal quests by talking to them, then completing the mission. This way they are more loyal to you and will be willing to work harder to complete the mission.
On one last note if you complete any side missions after "additional captives" are taken after you collect your squad you will not be in time to save all of them.

Infinite Paragon / Renegade
During the game you unlock training to redistribute skill points. The Talent Mastery unlock adds a certain percentage to your paragon / renegade. Respec your character and distribute into your mastery over and over until paragon and renegade are full.
Baldurs Gate refference
When her combat drone is summoned, Tali will occasionally shout, "Go for the optics! Go for the optics!" This may be a reference to Baldur's Gate 2's Minsc, who shouted, "Go for the eyes, Boo! Go for the eyes!" Tali's combat drone is named Chikktika, another subtle reference to Baldur's Gate 2. Chikktika Fastpaws is the loyal raccoon familiar of Baervan Wildwanderer, a gnomish deity worshipped by Aerie.

Legion doing the Robot
If you visit Legion in the AI core, and don't talk to him, after a short time he will start doing the Robot dance.

Elevators Reference
If you travel around with Tali and Garrus the recurring party members, eventually they will have a conservation about the elevators. Garrus will remember it fondly remembering the interesting conservations they had about Quarrians. While Tali gets very upset about to the point of threatening Garrus with her shotgun to stop.
Another Elevators Refference
During Miranda's loyalty mission, after getting on a very slow elevator with the first game's music, she hacks the elevator to move faster. This is a reference to the fan dislike of the first game's slow elevator rides.


Mortal Combat Reference
When Jacob uses Pull, he will sometimes yell "Get over here!" This is a reference to Mortal Kombat's Scorpion, who yells the same thing when pulling enemies towards him.


Sci-Fi Movie Reference *SPOILERS*
When EDI suggests giving her control of the ship to escape the Collectors', Joker refuses, screaming "If you start singing 'Daisy Bell' I'm done!" This references in last moments of the homicidal HAL computer in 2001: A Space Odyssey. Before he connects EDI to the control systems, he says "Great, this is where it starts, and when we're all just organic batteries, guess who they'll blame?" referring to The Matrix.

Video Game Salesman
Entry Location:
citadel
The video game salesman on the citadel makes references to GTA, Halo 3, Gamestop and Call of Duty. He uses different names for the games but its obvious what he's talking about.
Unlock Alternate Costume Colors
New Colors for Party Members: Complete a party member's loyalty mission.

Unlock Loyalty Skills: Complete the Loyalty missions for each of your party members to unlock their individuals skills.

Bonus 25% Experience
Bonus 25% Experience: Once you beat the game on any difficulty all characters will gain an additional 25% experience bonus.

Achievements
Missing in Action (5)- Save your crew from an overwhelming attack
Very Elusive (10)- Return to active duty
The Convict (10)- Successfully recruit the biotic Convict
The Krogan (10)-Successfully recruit the krogan
The Archangel (10)-Successfully recruit Archangel
The Professor (10)-
Successfully recruit the Professor
The Quarian (10)-Successfully recruit the quarian
The Justicar (10)-Successfully recruit the Justicar
The Assassin (10)-Successfully recruit the Assassin
Friend or Foe (10)-Obtain geth technology
Colony Defense (25)-Defend a human colony from attack
The Prodigal (10)-Gain the loyalty of the Cerberus Officer
Ghost of the Father (10)-Gain the loyalty of the Cerberus Operative
Catharsis (10)-Gain the loyalty of the biotic Convict
Battlemaster (10)-Gain the loyalty of the krogan
Fade Away (10)-Gain the loyalty of Archangel
The Cure (10)-Gain the loyalty of the Professor
Treason (10)-Gain the loyalty of the quarian
Doppelganger (10)-Help the Justicar resolve her mission
Cat's in the Cradle (10)-Gain the loyalty of the Assassin
A House Divided (10)-Hack a geth collective
Ghost Ship (25)-Complete the investigation of a derelict alien vessel
Suicide Mission (50)-Use the Omega 4 Relay
Mission Accomplished (125)-Save humanity throughout the galaxy from certain annihilation
Against All Odds (15)-Survive suicide mission
Insanity (75)-Complete the game on the "Insanity" difficulty level without changing the setting
No One Left Behind (75)-Keep your team alive through the suicide mission
Long Service Medal (75)-Complete Mass Effect 2 twice, or complete it once with a character imported from Mass Effect 1
Paramour (50)-Successfully pursue a relationship with a teammate
Head Hunter (10)-Perform 30 headshot kills with any weapon on humanoid targets
Brawler (10)-Shoot and kill 20 enemies while they're knocked back by a punch
Big Game Hunter (10)-Thresher Maw defeated
Tactician (10)-Hit 20 different targets with multiple biotic powers to combine the effects
Master at Arms (15)-Kill enemies with 5 different heavy weapons during the game
Merciless (10)-Make 20 enemies scream as they fall or are set on fire
Overload Specialist (15)-Disrupt the shields of 25 enemies
Warp Specialist (15)-Warp the barriers of 25 enemies
Incineration Specialist (15)-Incinerate the armor of 25 enemies
Operative (15)-Complete a mission discovered by scanning an unexplored world
Agent (50)-Complete 5 missions discovered by scanning unexplored worlds
Prospector (5)-Retrieve mineral resources by scanning and probing a planet in the galaxy map
Explorer (10)-Visit 100 percent of the planets in an unexplored cluster
Power Gamer (10)-Reach Level 30 with one character
Scholar (15)-Unlock 15 new Mass Effect 2 codex entries
Technician (15)-Obtain 10 technology upgrades
Weapon Specialist (15)-Fully upgrade a weapon
Scientist (10)-Complete any research project in the Normandy's laboratory
Fashionista (5)-Personalize your armor in your quarters on the Normandy
Power Full (15)-Evolve any power
Highly Trained (15)-View all advanced combat training videos at Shepard's private terminal.
300 refference
During Tali's recruitment, when told the sun will overload their shields Grunt will defiantly say: "Then we will fight in the shade... but no hiding!".

Shredder Ammo HELPS A LOT
Entry Location:*SPOILERS*Shredder Ammo is a extreme help on every enemy except geth and mechs.Most extra loyalty moves you can get dont compare to shredder ammo except slam and armor piercing ammo.Shredder Ammo works great against all the living things,including collectors.During the suicide mission this helps you out a great deal because the collectors are living,and Shredder Ammo rips them apart.With a fully upgraded gun and shredder,no living thing can compare to you.

All Squad Members Survive *SPOILERS*
Entry Location:
Suicide Mission
First for the tech expert at the first part use Legion the geth 2nd use miranda as team two leader. Next part use Grunt as an escort and use samara as the person to make a kinetic barrier. WARNING do not take jack with you at this part exiting she will be cuaght by seeker swarms. Take miranda and Tali.

How to Be Sure You and Your Squad Survive *SPOILERS*
Your choices during the Final part of the game are largely irrelevant so long as who you choose for each role makes sense. For example when you need a powerful biotic don't use someone who is a split specialization. Otherwise make sure you buy the shields, armor, and weapon upgrades for the Normandy or you won't last long. Also make sure you complete all of your squads personal quests by talking to them, then completing the mission. This way they are more loyal to you and will be willing to work harder to complete the mission.
On one last note if you complete any side missions after s"additional captives" are taken after you collect your squad you will not be in time to save all of them.

Faster Planet Mineral Scanning
For a faster way to scan the planets move cursor to the left or the right of the planet you're scanning and point both analog sticks the same direction. It will double the spin speed of the planet and allow finding resources on that grid line even faster.