Beat the game on Commander+ difficulty in Ironman mode

Beat a mission on Commander+ with a squad of soldiers only of the same class (but not Rookie)

Sell goods worth 1000 supplies to the Black Market (Can span multiple games)

Create the Commander's Avatar

Build a radio relay on every continent

Kill a Sectopod on the same turn you encounter it (in Single Player)

Kill an Avatar

Kill 3 enemies in a single turn, with a single soldier, without explosives

Beat a mission in June or later using only Rookies

Kill 500 aliens. (does not have to be in same game)

Cause an enemy to fall to its death

During open play, score a long-distance goal with a defender (25 yards out)