ME3: Defeat a harvester.

ME3: Destroy an Atlas dropped from orbit.

ME3: Escape a Reaper in the galaxy map.

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

ME3: Chase down an assassin.

ME2: Warp the barriers of 25 enemies

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

ME2: Save humanity throughout the galaxy from certain annihilation

ME2: Use the Omega 4 Relay

ME2: Obtain geth technology

ME2: Fully upgrade a weapon

ME2: Help the Justicar resolve her mission