Mission Accomplished

ME2: Save humanity throughout the galaxy from certain annihilation

Against All Odds

ME2: Survive suicide mission

Suicide Mission

ME2: Use the Omega 4 Relay

A House Divided

ME2: Hack a geth collective

Friend or Foe

ME2: Obtain geth technology

Treason

ME2: Gain the loyalty of the quarian

The Cure

ME2: Gain the loyalty of the Professor

Battlemaster

ME2: Gain the loyalty of the krogan

Big Game Hunter

ME2: Thresher Maw defeated

Weapon Specialist

ME2: Fully upgrade a weapon

Ghost of the Father

ME2: Gain the loyalty of the Cerberus Operative

The Quarian

ME2: Successfully recruit the quarian

Catharsis

ME2: Gain the loyalty of the biotic Convict

Doppelganger

ME2: Help the Justicar resolve her mission

Cat's in the Cradle

ME2: Gain the loyalty of the Assassin

Broke, Blind, and Bedlam

ME2: Gain the loyalty of the thief

Heart of Darkness

ME2: Confront the Shadow Broker

The Prodigal

ME2: Gain the loyalty of the Cerberus Officer

The Justicar

ME2: Successfully recruit the Justicar

The Assassin

ME2: Successfully recruit the Assassin

Ghost Ship

ME2: Complete the investigation of a derelict alien vessel

Fade Away

ME2: Gain the loyalty of Archangel

Agent

ME2: Complete 5 missions discovered by scanning unexplored worlds

Digital Exorcist

ME2: Successfully shut down the rogue VI in Project Overlord

Tactician

ME2: Hit 20 different targets with multiple biotic powers to combine the effects

The Krogan

ME2: Successfully recruit the krogan

Colony Defense

ME2: Defend a human colony from attack

Galactic Explorer

ME2: Visit 100% of the planets in an unexplored cluster

Power Full

ME2: Evolve any power

Operative

ME2: Complete a mission discovered by scanning an unexplored world

The Convict

ME2: Successfully recruit the biotic Convict

The Archangel

ME2: Successfully recruit Archangel

Head Hunter

ME2: Perform 30 headshot kills with any weapon on humanoid targets

Scholar

ME2: Unlock 15 new Mass Effect 2 codex entries

Scientist

ME2: Complete any research project in the Normandy's laboratory

The Professor

ME2: Successfully recruit the Professor

Merciless

ME2: Make 20 enemies scream as they fall or are set on fire

Very Elusive

ME2: Return to active duty

Missing in Action

ME2: Save your crew from an overwhelming attack