Conversation so far:
How many peaks did Edmund Hillary climb after Everest?
Edmund Hillary climbed ten other peaks in the Himalayas on further visits.
What years was Edmund Hillary's climbing of other Himalayan peaks besides Everest in?
Edmund Hillary climbed ten other peaks in the Himalayas on further visits in 1956, 1960–1961, and 1963–1965.

Question: What other accomplishment did he acheive?
Self-contained rewrite: What other accomplishment did Edmund Hillary acheive besides climbing Everest and other Himalayan peaks?