ME3: Send a warning across the galaxy.

ME3: Call down an orbital strike.

ME3: Sabotage a dreadnought.

ME3: Win a political stand-off.

ME3: Kill a brute while it's charging you.

ME3: Escape a Reaper in the galaxy map.

ME3: Evolve any of your powers to rank 6.

ME3: Set 100 enemies on fire with powers.

ME3: Chase down an assassin.

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

ME2: Save humanity throughout the galaxy from certain annihilation

Kill 2,000 enemies in Mass Effect 1, 2 or 3

ME2: Obtain geth technology