The 2002 Turkish general election is the canonical example of total electoral wipeout. Every party holding seats in the previous legislature was completely wiped out. Of the two parties that won seats in the 2002 election, the one that formed government didn’t even exist at the time of the previous election (current president Erdoğan’s AK Party, formed in 2001). Of note, it wasn’t a complete changing of the guard: one of the three independent members from the 1999 parliament won his seat again in 2002 (Mehmet Ağar), though it seems he took over as leader of one of the wiped-out parties shortly after the election.
Hat tip to kynakwado2 on Twitter.