Over the course of a semester, spend at least one night (sleeping) in every single residence on campus. You are not required to be in a bed, or even someone's room, so long as you supply your own sleeping bag.
Take note that Dons who catch you sleeping in the stairwell may not be happy and kick you out, voiding that attempt in the residence.
Residences:
Adelaide Hall or Ban Righ Hall
Brant House
Chown Hall
Gordon/Brockington House
Graduate Residence (JDUC)
Harkness Hall
Jean-Royce Hall Phase I
Jean-Royce Hall Phase II
Leggett Hall
Leonard Hall
McNeill House
Morris Hall
Smith House
Waldron Tower
Watts Hall
Victoria Hall