During a campaign, kill 100 Xenomorphs.

Prevent a marine from being Abducted.

Finish the Prologue.

ME1: Acquire all trophies

ME1: Use AI Hacking 25 times

ME1: Use Damping Field 25 times

ME1: Find all primary Alien: Council Races, Extinct Races and Non-Council Races codex entries

ME1: Complete the game on any difficulty

Establish a romantic relationship in Mass Effect 1, 2 or 3

ME1: Accumulate 75% of total possible Paragon or Renegade points

ME1: Complete the Bring Down the Sky mission.

ME1: Use Neural Shock 25 times

ME1: Land on 8 uncharted worlds