At the 2015 Nordic Junior World Ski Championships in Almaty, Yakimushkin won silver in 10 km classical/freestyle skiathlon and gold as part of the relay team.

Yakimushkin won his first national championships title in Syktyvkar, in 15 km freestyle.

After scoring three individual podiums and showing solid performance in the Tour de Ski (4th place) he finished second in both overall and distance standings of the World Cup only behind his teammate Alexander Bolshunov.

In an interview to the Russian Olympic Channel in February 2021 Yakimushkin said he has no special pre-race rituals or habits, underlined key role of his family in his athletic upbringing and career, and named Alexey Prokurorov as the only sportsperson he could call a kind of a childhood idol.

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