Overload Specialist
ME2: Disrupt the shields of 25 enemies
Galactic Explorer
ME2: Visit 100% of the planets in an unexplored cluster
Operative
ME2: Complete a mission discovered by scanning an unexplored world
Broke, Blind, and Bedlam
ME2: Gain the loyalty of the thief
Scientist
ME2: Complete any research project in the Normandy's laboratory
The Professor
ME2: Successfully recruit the Professor
The Archangel
ME2: Successfully recruit Archangel
Power Full
ME2: Evolve any power
Very Elusive
ME2: Return to active duty
Missing in Action
ME2: Save your crew from an overwhelming attack
Completionist
ME1: Complete the majority of the game
First Aid Specialist
ME1: Use medi-gel 50 times
Archivist
ME1: Find all primary Alien: Council Races, Extinct Races and Non-Council Races codex entries
Medal of Honor
ME1: Complete the game on any difficulty
Insanity I
Complete Mass Effect 1, 2 or 3 on Insanity without changing difficulty
Neural Shock Specialist
ME1: Use Neural Shock 25 times
AI Hacking Specialist
ME1: Use AI Hacking 25 times
Singularity Mastery
ME1: Use biotic Singularity 25 times
Meritorious Service Medal
ME1: Complete Ilos
Paramour I
Establish a romantic relationship in Mass Effect 1, 2 or 3