Mezue ahịrịokwu na-esonụ: Mgbe ọ na-egwuri egwu maka St. Louis AAA Blues U16 ma tinye aka na USA Hockey National Team Development Program (USNDPT), Tkachuk kwetara igwu egwu maka Mahadum Boston mgbe emechara oge abụọ na USNDPT. Mgbe ọ na-egwu egwuregwu maka ndị otu Boston Terriers nke mahadum, o nwere ihe mgbaru ọsọ anọ na isi ihe iri na anọ na egwuregwu 19 dị ka nwa akwụkwọ mbụ tupu ya emee ndị otu mba United States n'okpuru afọ 20 maka ndị otu Boston Terriers.
2018 World Junior Championships. Na nso ngwụcha oge, a họpụtara Tkachuk maka Hockey East Rookie Team mgbe ọ nọ na nke ise na otu na isi ihe.