XCOM: Enemy Within achievements

You Win, Everything

Beat the game without buying a Squad Size upgrade on Classic or Impossible difficulty

Designate a highly decorated soldier as the Volunteer

Field a squad with 4 augmented soldiers, each with a different base ability and win the mission

Field a squad consisting entirely of augmented soldiers and SHIVs (min. 4) and win the mission

Have your special-duty soldier kill three enemies in the same mission

Kill an enemy as it is psionically attacking you in single player

Kill an unseen enemy detected by a specially modified soldier in single player

Field a squad where all members have at least two modifications (min. 4) and win the mission

Have your special-duty soldier kill three enemies in the same mission

Kill an elite enemy Sniper with one of your own snipers in single player

Jump two stories in one move in single player