Final answer:
Charlie Conacher led the Toronto Maple Leafs to consecutive Stanley Cup championships in the 1933-34 and 1934-35 seasons.
Step-by-step explanation:
The missing word that describes what Conacher achieved in the 1933-34 and 1934-35 seasons is championships. Charlie Conacher, a renowned Canadian ice hockey player, led the Toronto Maple Leafs to consecutive Stanley Cup victories during those seasons. During his career, Conacher was recognized for his scoring abilities and his contribution to his team's success, not only for individual accolades like hat tricks or assists but most notably for being a key player in securing back-to-back championship titles.