Search the indicated location or complete the indicated task to get the corresponding weapon:
M3 Predator: First weapon acquired during the Prologue.
Scorpion: In the "Priority: Sur'Kesh" mission, it is found on the floor where Mordin requires you to reactivate the elevator power source. After reactivating the power, find the weapon before turning on the elevator.
M-5 Phalanx: In the "Priority: Tuchanka" mission, it is found on the ground, up the steps leading to the long stretch where the Reaper starts firing its laser at your team.
M-358 Talon: In the "Priority: Citadel" mission, while in C-Sec HQ, you will enter a dark hallway with four offices. One of the first offices is locked. Proceed down the only path forward to find a computer console that will open the office door. Go back and open the door to find the pistol near some other weapons.
M-6 Carnifex: In the "Arrae: Ex-Cerberus Scientists" side-mission, it is found on a pipe in the red-bathed maintenance hallway before taking the ladder up.
Arc Pistol: In the "Priority: Geth Dreadnought" mission, it will be given to Shepard by Tali.
M-77 Paladin: It can be purchased from Spectre Requisitions terminal in the Spectre Office at the Citadel for 200,000 credits.
M-23 Katana: In the "Priority: Mars" mission, it will be given as a starting weapon.
M-27 Scimitar: In the "Priority: Palaven" mission, it is found in the main Turian camp on the ground as you exit for your first objective.
M-22 Eviscerator: In the "Grissom Academy: Investigation" mission, it is found on a red couch after saving the first student.
M-300 Claymore: In the "Attican Traverse: Krogan Team" mission, it is found in the abandoned camp in the left building just as you enter.
Graal Spike Thrower: In the "Priority: Tuchanka" mission, it is found near a guard waiting by the railing just as the mission begins.
Disciple: In the "Lesuss: Ardat-Yakshi Monastery" mission, it is found after discovering the lone Asari, and entering a combat room filled with Cannibals and a shield generator.
Geth Plasma Shotgun: In the "Priority: Rannoch" mission, enter the large combat area with the Geth on a balcony. Kill the enemies, then search right of the area's entrance to find this weapon.
M-11 Wraith: It can be purchased from Spectre Requisitions terminal in the Spectre Office at the Citadel for 250,000 credits.
M-4 Shuriken: In the "Priority: Mars" mission, it is found inside a lobby security room where Liara works at a computer. Pick up this weapon before activating the security console.
M-9 Tempest: In the "Tuchanka: Turian Platoon" mission, it is found on the ground after defeating a set of unaware Husks and climbing a ladder up, deeper into the caves.
M-25 Hornet: In the "Priority: Citadel" mission, it is found after entering a new area and taking an elevator up; look on the right side for a few items, including this weapon.
M-12 Locust: In the "Priority: Horizon" mission, it is found on the right side of the early lab.
M-8 Avenger: Acquired during the Prologue.
M-15 Vindicator: In the "Priority: Mars" mission, just before entering the Archive chamber, you will see a small security room just off the main hallway. It is inside.
M-96 Mattock: In the "Grissom Academy: Investigation" mission, it is found after leaving the classroom; search the hallway with the red benches.
Phaeston: In the "Tuchanka: Turian Platoon" mission, it is found after chasing off a Harvester and running into some dead Turians in your path. Look near the bodies for this powerful weapon.
M-76 Revenant: In the "Priority: Citadel" mission, it is found before running into a Combat Engineer working on a latch. When you spot him, kill him, but do not work on the latch yourself. Turn around, and enter the restroom of the previous area to find this weapon.
Geth Pulse Rifle: In the "Priority: Perseus Veil" mission, it is found near the control room. It is on a shelf almost directly in your main path, just off to the right.
M-99 Saber: Acquired during the "Priority: Horizon" mission.
M-37 Falcon: Acquired during the "Priority: Cerberus HQ" mission.
M-92 Mantis: In the "Priority: Mars" mission, just after taking the ladder down, look to your right to find this weapon on the ground.
M-97 Viper: In the "Priority: Palaven" mission, it is found on some boxes in the center of the main Turian camp.
M-13 Raptor: In the "Priority: Sur'Kesh" mission, it is found on a bench overlooking the outer facility on the floor where Mordin requires you to reset the elevator power source.
M-29 Incisor: In the "Tuchanka: Bomb" side-mission, it is found on a ramp just as you exit the first combat zone.
Javelin: Acquired during the "Rannoch: Admiral Koris" mission.
M-98 Widow: Acquired during the "Priority: Thessia" mission.
Black Widow: It can be purchased from Spectre Requisitions terminal in the Spectre Office at the Citadel for 250,000 credits.
Multiplayer item pack unlockables:
All item pack unlockables are random. Each pack includes a certain rarity of unlockable items, which are as follows:
The Recruit pack costs 5,000 credits. Every item in the list below can be acquired through the Recruit pack. Once you acquire all Common and Uncommon items, you will begin unlocking Rare and Ultra Rare items.
The Veteran pack costs 20,000 credits. This pack is expensive, but it provides a better chance at unlocking Uncommon and Rare items.
The Spectre pack costs 60,000 credits. This pack is very expensive, but it provides a better chance at unlocking Uncommon, Rare, and Ultra Rare items.
All weapons can be acquired ten times. Acquiring a weapon more than once will increase that weapon's upgrade level. Weapon Mods can also be acquired multiple times, as well as Cobra Missile Capacity, Medi-Gel, Thermal Clips, and other bonuses.
Assault Rifle Magazine Upgrade
Assault Rifle Precision Scope
Assault Rifle Stability Damper
Pistol High Caliber Barrel
Shotgun Blade Attachment
Shotgun High Caliber Barrel
Shotgun Smart Choke
Sniper Rifle Spare Thermal Clip
Cobra Missile Launcher
Ops Survival Pack
Thermal Clip Pack
Human Characters (appearance unlockables)
Pack Specific Bonus
Ammo Bonus Items Rank 1 (Recruit pack only)
Armor Bonus Items Rank 1 (Recruit pack only)
Weapon Bonus Items Rank 1 (Recruit pack only)
Assault Rifle Piercing Mod
Assault Rifle Stability Damper
Pistol Melee Stun
Pistol Piercing Mod
SMG Ultralight Materials
Sniper Rifle Enhanced Scope
Sniper Rifle Extended Barrel
Shotgun Shredder Mod
Shotgun Spare Thermal Clips
Pack Specific Bonus
Ammo Bonus Items Rank 2 (Veteran pack only)
Armor Bonus Items Rank 2 (Veteran pack only)
Weapon Bonus Items Rank 2 (Veteran pack only)
Geth Pulse Rifle
Geth Pulse Shotgun
Graal Spike Thrower
Cobra Missile Launcher Capacity Upgrade +1
Medi-Gel Capacity Upgrade +1
Ops Survival Pack Capacity Upgrade +1
Thermal Clip Pack Capacity Upgrade +1
Pack Specific Bonus
Ammo Bonus Items Rank 3 (Spectre pack only)
Armor Bonus Items Rank 3 (Spectre pack only)
Weapon Bonus Items Rank 3 (Spectre pack only)
Intel locations ("From Ashes" DLC)
Search the indicated locations to find the three pieces of intel in the "From Ashes" downloadable content and get the "Freedom Fighter" achievement:
1. Just as you land on the planet, the first piece of intel can be found inside a building to your right. Before continuing to the elevator ahead, enter the building marked with a "6", and use the computer inside.
2. Take the elevator down into a new arena full of enemies. Kill all of them, then return to the area you started from (where you stepped off the elevator). From there, look to the left to see a building marked with a "5". Inside is a computer console with the second piece of intel.
3. Look from where you found the second piece of intel to see a building marked with a large "2". The intel is inside that building. Go through the building, and turn left. You will enter a large room with computer keyboards attached to a desk along the wall. Use the center keyboard to get the final piece of intel and the "Freedom Fighter" achievement.
Using powers on final level
Note: The following trick requires a Kinect. In London on Earth, Harbinger will shoot his laser and knock everyone running to the teleporter that is on the ground linked to the Citadel. You will then get up and start walking in slow motion to the teleporter armed only with a pistol that has infinite ammunition. You normally cannot use your powers with LB or RB. However, you can use Kinect voice commands such as "Carnage", "Warp", "Singularity", or any other projectile power, and Shepard will use the power while in the slow motion state.
Blasto 6 movie
In the Presidium Commons section of the Citadel, go to the Apartments area. In the hallway, you can activate a movie advertisement on the wall for Blasto 6: Partners In Crime. It involves Blasto, the Hanar Spectre with his Elcor partner.
You can recover your space hamster from Mass Effect 2 by going to Engineering on the Normandy. Go to the lowest level using the stairs. You should then hear some squeaking. If you are fast enough, you can catch your space hamster for your quarters.
Star Wars: The Empire Strikes Back reference
During the side-mission where you evacuate some Cerberus scientists, the AA-Turrets will fire a path for the evac-shuttle through enemy fighters, and then a voice will announce that the first evac-shuttle has successfully started. This is followed by a cheer from the remaining crew, like in the Hoth scene in Star Wars: Episode 5 - The Empire Strikes Back.